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- H.248The Gateway Control Protocol (Megaco, H.248) is an implementation of the media gateway con
- H.261H.261 is an ITU-T video compression standard, first ratified in November 1988. It is the f
- H.262/MPEG-2 Part 2H.262 or MPEG-2 Part 2 (formally known as ITU-T Recommendation H.262 and ISO/IEC 13818-2,
- H.323Audio-visual communication signaling protocol
- H2k-GamingH2k-Gaming was a professional esports organization based in London, United Kingdom. It was
- Haas Type FoundryHaas Type Foundry (Haas'sche Schriftgiesserei) was a Swiss manufacturer of foundry type. F
- Hachette v. Internet Archive2023 American court case
- HackathonEvent in which groups of software developers work at an accelerated pace
- HackerTerm for computer intruders and computing experts
- Hacker ethicCommon moral values of hacker culture
- Hacker ManifestoManifesto from 1986 by Loyd Blankenship
- Hackers on Planet EarthConference series
- HackerspaceCommunity organization
- Hacking of consumer electronicsCustomization of devices beyond what is normally possible
- HackThisSiteOrganization
- HacktivismComputer-based activities as a means of protest
- HacktivismoHacktivismo is an offshoot of Cult of the Dead Cow (cDc), whose beliefs include access to
- Hadley WickhamNew Zealand statistician (born 1979)
- Hafnium (group)Hafnium (sometimes styled HAFNIUM; also called Silk Typhoon by Microsoft) is a cyber espio
- Haha, I'm SorryHaha, I'm Sorry is the first extended play by American recording artist Kitty. It was rele
- HAIFA constructionThe HAIFA construction (hash iterative framework) is a cryptographic structure used in the
- Haiku (operating system)Computer operating system
- HAL (software)HAL (Hardware Abstraction Layer or rather Hardware Annotation Library) is a software subsy
- Half-precision floating-point format16-bit computer number format
- Halloween documentsConfidential Microsoft strategies against free and open-source software
- Hallucination (artificial intelligence)Erroneous AI-generated content presented as true
- HAMMER (file system)File system from DragonFly BSD
- Hamming distanceNumber of bits that differ between two strings
- Hamming graphHamming graphs are a special class of graphs named after Richard Hamming and used in sever
- Han unificationEffort to map CJK characters in Unicode
- Hand geometryHand geometry is a biometric that identifies users from the shape of their hands. Hand geo
- Handheld PCClass of personal computers that is significantly smaller than a laptop
- Handle (computing)Abstract reference to a system resource in computing
- HandoverIn cellular telecommunications, handover, or handoff, is the process of transferring an on
- Handshake (computing)Signal between two devices or programs
- Handwriting recognitionAbility of a computer to receive and interpret intelligible handwritten input
- Hang (computing)When a process becomes non-responsive
- Hang Seng China Enterprises IndexHang Seng China Enterprises Index is a stock market index of The Stock Exchange of Hong Ko
- Harald NiederreiterHarald G. Niederreiter (born June 7, 1944) is an Austrian mathematician known for his work
- Hard disk drive failureElectromechanical malfunctioning
- Hard linkDirectory entry (in a directory-based file system) that associates a name with a file
- Hardening (computing)Process of increasing the security of a system
- Hardware abstractionSoftware that hides details of hardware access
- Hardware accelerationSpecialized computer hardware
- Hardware performance counterRegisters that count hardware-related activities
- Hardware random number generatorCryptographic device
- Hardware securitySecurity architecture implemented in hardware
- Hardware security modulePhysical computing device
- Hardware TrojanA Hardware Trojan (HT) is a malicious modification of the circuitry of an integrated circu
- Hardware virtualizationVirtualization of computers or operating systems
- Hardware-assisted virtualizationIn computing, hardware-assisted virtualization is a platform virtualization approach that
- Hardware-based full disk encryptionCryptographic hardware
- Hardware-in-the-loop simulationTechnique used in the development and testing of complex real-time embedded systems
- HarmonyOS 5Distributed operating system
- Harris Computer SystemsAmerican computing vendor
- Harry GarlandHarry T. Garland (born 1947) is a scientist, engineer, author, and entrepreneur who co-fou
- Hartley (unit)Unit of information
- Hartmanis–Stearns conjectureOpen problem in computer science
- Harvard architectureComputer architecture where code and data each have a separate bus
- Harvard Mark IEarly American electromechanical computer (1944)
- Harwell computerEarly British computer
- Hash collisionHash function phenomenon
- Hash functionMapping arbitrary data to fixed-size values
- HashtagMetadata tag prefixed with #
- HaskellFunctional programming language
- Haskell featuresFeatures in Haskell programming language
- Haswell (microarchitecture)2013 processor microarchitecture
- Hayes AT command setCommand language for modems
- Hayes Microcomputer ProductsU.S.-based manufacturer of modems
- HBO MaxAmerican video streaming service
- HD DVDObsolete optical disc format
- HDMIDigital audiovisual data interface
- HeadphonesDevice put on or in the ears that plays sound
- Heap overflowSoftware anomaly
- Heap sprayingTechnique in computer security
- Heaps' lawIn linguistics, Heaps' law (also called Herdan's law) is an empirical law which describes
- Heart's Content, Newfoundland and LabradorHeart's Content is an incorporated town in Trinity Bay on the Bay de Verde Peninsula of Ne
- Heartbeat (computing)Synchronization primitive for fault tolerance
- HeartbleedSecurity bug in OpenSSL
- HectographyPrinting process that involves transfer of an original
- Héctor García-MolinaMexican computer scientist (1954–2019)
- HeidiSQLAdministration tool for relational databases
- Heinz RutishauserHeinz Rutishauser (30 January 1918 – 10 November 1970) was a Swiss mathematician and a pio
- Heinz ZemanekAustrian computer pioneer
- Helen NibouarAmerican cryptographer
- Helical antennaAntenna with conducting wires in a helix
- Helical scanHelical scan is a method of recording high-frequency signals on magnetic tape, used in ope
- Helix (database)Helix is a database management system for the Apple Macintosh platform, created in 1983. H
- Helmholtz equationEigenvalue problem for the Laplace operator
- Helmut SchreyerGerman inventor, electrical engineer and computer pioneer (1912–1984)
- HelveticaNeo-grotesque sans-serif typeface
- Henri BalHenri Elle Bal (born 16 April 1958) is a professor of computer science at the Vrije Univer
- Henrik Frystyk NielsenHenrik Frystyk Nielsen (born 1969) is a Danish engineer and computer scientist. He is best
- Henry Baker (computer scientist)Henry Givens Baker Jr. is an American computer scientist who has made contributions in gar
- Henry Hudson KitsonHenry Hudson Kitson (April 9, 1863, 1864 or 1865 – June 26, 1947) was an English-American
- Hepting v. AT&TClass action lawsuit
- Her (dating app)American dating app for lesbian, queer and bisexual women and non-binary people
- Herb GroschAmerican computer scientist
- Herbert YardleyHerbert Osborn Yardley (April 13, 1889 – August 7, 1958) was an American cryptologist. He
- Here Comes Everybody (book)Here Comes Everybody: The Power of Organizing Without Organizations is a book by Clay Shir
- Hermann BottenbruchHermann Bottenbruch (14 September 1928 – 20 May 2019) was a German mathematician and compu
- HerokuCloud Platform as a service
- HerotelHerotel previously known as Snowball Effect is a South African Internet service provider (
- Hessian form of an elliptic curveIn geometry, a Hessian curve is a cubic plane curve similar to the folium of Descartes tha
- Heterogeneous computingComputer architecture that utilizes multiple, different processing methods
- Heterogeneous System ArchitectureComputing system
- Heuristic (computer science)Type of algorithm, produces approximately correct solutions
- Hex dumpHexadecimal view of computer data
- HFS PlusJournaling file system developed by Apple
- HIARCSHIARCS is a proprietary UCI chess engine developed by Mark Uniacke. Its name is an acronym
- Hibernate (framework)Object–relational mapping tool
- Hibernation (computing)Powering down a computer while retaining its state
- Hidden Field EquationsPublic key cryptosystem
- Hidden-line removalIn 3D computer graphics, solid objects are usually modeled by polyhedra. A face of a polyh
- Hidden-surface determinationVisibility in 3D computer graphics
- Hierarchical clusteringStatistical method in data analysis
- Hierarchical file systemIn computing, a hierarchical file system is a file system that uses directories to organiz
- Hierarchical File System (Apple)Hierarchical File System (HFS) is a proprietary file system developed by Apple Inc. for us
- Hierarchical network modelHierarchical network models are iterative algorithms for creating networks which are able
- Hierarchical storage managementData storage technique
- HierocryptFamily of block ciphers
- High availabilitySystems with high up-time, a.k.a. "always on"
- High availability softwareHigh-availability software is software used to ensure that systems are running and availab
- High Bandwidth MemoryType of memory used on processors that require high transfer rate memory
- High Capacity Color BarcodeType of matrix barcode
- High colorHigh color graphics is a method of storing image information in a computer's memory such t
- High fidelityHigh-quality reproduction of sound
- High frequency3–30 MHz range of the electromagnetic spectrum
- High Orbit Ion CannonDenial-of-service attack tool
- High Performance File SystemFilesystem created for OS/2 operating system
- High Speed Packet Access3G mobile telecommunications protocols
- High-availability clusterGroup of computers that run with minimum downtime
- High-definition televisionTV resolution standard
- High-Definition Versatile DiscHigh-Definition Versatile Disc (HVD) is an Asian standard of advanced high-definition tech
- High-level programming languageProgramming language with hardware abstraction
- High-pass filterType of electronic circuit or optical filter
- High-performance computingComputing with supercomputers and clusters
- High-κ dielectricIn the semiconductor industry, the term high-κ dielectric refers to a material with a high
- Higher Speed PONHigher Speed PON (also known as G.9804, HSP) is a family of ITU-T recommendations (compute
- Higher-order abstract syntaxIn computer science, higher-order abstract syntax (abbreviated HOAS) is a technique for th
- Higher-order functionFunction that takes one or more functions as an input or that outputs a function
- Hindley–Milner type systemType system used in computer programming and mathematics
- HipHop for PHPSet of alternative PHP implementations developed by Facebook
- HiQ Labs v. LinkedIn2019 United States court case
- History (command)In computing, various shells maintain a record of the commands issued by the user during t
- History of Apple Inc.Apple Inc., originally Apple Computer, Inc., is an American multinational corporation that
- History of AT&TTelecommunications history
- History of cloud computingThe concept of the cloud computing as a platform for distributed computing traces its root
- History of compiler constructionIn computing, a compiler is a computer program that transforms source code written in a pr
- History of computer hardware in Eastern Bloc countriesThe history of computing hardware in the Eastern Bloc is somewhat different from that of t
- History of computer hardware in YugoslaviaTo protect domestic production from foreign competition, which was often done to an excess
- History of computing hardware (1960s–present)The history of computing hardware starting at 1960 is marked by the conversion from vacuum
- History of computing in PolandThe history of Polish computing (informatics) began during the Second World War with break
- History of computing in RomaniaThe first efforts to build electronic computers in Romania began at the Institute of Atomi
- History of computing in South AmericaComputing started in south America in 1957, when the first digital computer arrived in Chi
- History of computing in the Soviet UnionThe history of computing in the Soviet Union began in the late 1940s, when the country beg
- History of CP/CMSThis article covers the History of CP/CMS — the historical context in which the IBM time-s
- History of Delphi (software)Programming language history
- History of emailThe history of email entails an evolving set of technologies and standards that culminated
- History of free and open-source softwareThe history of free and open-source software begins at the advent of computer software in
- History of general-purpose CPUsThe history of general-purpose CPUs is a continuation of the earlier history of computing
- History of GoogleGoogle was officially launched in 1998 by Larry Page and Sergey Brin to market Google Sear
- History of hard disk drivesIn 1953, IBM recognized the immediate application for what it termed a "Random Access File
- History of IBM magnetic disk drivesIBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard di
- History of IBM mainframe operating systemsHistorical account
- History of iTunesHistory of the iTunes application and e-commerce platform
- History of laptopsThe history of laptops describes the efforts, begun in the 1970s, to build small, portable
- History of LinuxLinux began in 1991 as a personal project by Finnish student Linus Torvalds to create a ne
- History of MicrosoftMicrosoft is a computer technology corporation founded on April 4, 1975, by Bill Gates and
- History of operating systemsAspect of computing history
- History of personal computersThe history of personal computers as mass-market consumer electronic devices began with th
- History of programming languagesThe history of programming languages spans from documentation of early mechanical computer
- History of PythonHistory of the Python programming language
- History of RISC OSRISC OS, the computer operating system developed by Acorn Computers for their ARM-based Ac
- History of smartphonesThe first commercial smartphones are widely recognized to be the IBM Simon Personal Commun
- History of software configuration managementThe history of software configuration management (SCM) can be traced back as early as the
- History of software engineeringThe history of software engineering begins around the 1960s. Writing software has evolved
- History of synthetic-aperture radarHistory of a radar technology
- History of tablet computersThe history of tablet computers and the associated special operating software is an exampl
- History of the Actor modelIn computer science, the Actor model, first published in 1973, is a mathematical model of
- History of the AmigaAmiga is a family of home computers that were designed and sold by the Amiga Corporation (
- History of the floppy diskA floppy disk is a disk storage medium composed of a thin and flexible magnetic storage me
- History of the graphical user interfaceThe history of the graphical user interface, understood as the use of graphic icons and a
- History of the web browserA web browser is a software application for retrieving, presenting and traversing informat
- History of UnixThe history of Unix dates back to the mid-1960s, when the Massachusetts Institute of Techn
- Hitachi 6309Hitachi variant of the Motorola 6809 8-bit microprocessor
- HITS algorithmLink analysis algorithm for webpages
- HLT (x86 instruction)Computer instruction which pauses execution
- HMACComputer communications authentication algorithm
- Hoare logicRules to verify computer program correctness
- Hofstadter's lawAdage referring to time estimates
- HOL (proof assistant)HOL (Higher Order Logic) denotes a family of interactive theorem proving systems using sim
- HOL LightHOL Light is a proof assistant for classical higher-order logic. It is a member of the HOL
- Holevo's theoremHolevo's theorem is an important limitative theorem in quantum computing, an interdiscipli
- Holographic data storageData storage technology
- Holographic Versatile DiscNovel optical disc based on holography
- Home automationBuilding automation for a home
- Home computerClass of microcomputers
- Home directoryDirectory to hold files for a specific user
- Home networkType of computer network
- Home pageMain page of a website
- Home serverComputing server located in a private residence
- Homebrew Computer ClubComputer hobbyist users' group in California
- Homeland securityUnited States notion of safety from terrorism
- Homeland Security Act of 2002Post-9/11 United States law establishing the Department of Homeland Security
- Homomorphic encryptionForm of encryption that allows computation on ciphertexts
- HoneyMonkeyMicrosoft Research honeypot
- Honeypot (computing)Computer security mechanism
- Honeywell 6000 seriesThe Honeywell 6000 series computers were rebadged versions of General Electric's 600-serie
- Hopscotch hashingCollision resolution scheme
- Horizon accounting systemAccounting software, 1999
- Horizon effectWeakness of game-playing artificial intelligence
- Horizon scanningMethodology in futures studies
- Horn clauseType of logical formula
- Horovod (machine learning)Deep learning training framework
- Host (network)Computer connected to a network
- Host protected areaArea of hard drive that is not visible to operating system
- Host-based intrusion detection systemType of intrusion detection system
- HostnameLabel that is assigned to a device connected to a computer network
- Hosts (file)Computer configuration file to map hostnames to IP addresses
- Hot metal typesettingMechanical analog method for text composition
- Hot swappingConcept in computing
- HotSpotJava virtual machine
- HP CloudSet of cloud computing services
- HP EliteBookLine of high-end laptops from Hewlett-Packard
- HP EnvySemi-discontinued line of high-end laptops and desktops, and line of printers from HP
- HP FOCUSThe Hewlett-Packard FOCUS microprocessor, launched in 1982, was the first commercial, sing
- HP Integral PCThe HP Integral PC (or HP 9807A) is a portable UNIX workstation computer system produced b
- HP ZHP Z is a series of professional workstation computers developed by Hewlett-Packard. The f
- HP-UXOperating system
- HPE SuperdomeThe HPE Superdome is a high-end server computer designed and manufactured by Hewlett Packa
- HPXHPX, short for High Performance ParalleX, is a runtime system for high-performance computi
- HSQLDBJava-based database engine
- HTC Dream2008 Android smartphone designed by HTC
- HTC One (M7)HTC One (codenamed and retroactively called M7) is a touchscreen-based Android smartphone
- HTC One seriesHTC One is a series of Android and Windows Phone smartphones designed and manufactured by
- HTC One VThe HTC One V is a smartphone designed and manufactured by HTC as part of the HTC One seri
- HTC One XAndroid smartphone designed and manufactured by HTC
- HTC Sensation XLHTC Sensation XL is touchscreen-based, slate-sized Android smartphone manufactured by HTC.
- HTML attributeSpecial words used inside the opening tag to control the element's behaviour
- HTML audioHTML element
- HTML editorSoftware for editing HTML
- HTML elementIndividual component of an HTML document
- HTML videoHTML element
- HTML5Fifth and previous version of HyperText Markup Language
- HtmxJavaScript library for web applications
- HTTP 404Internet error message
- HTTP 451HTTP status code
- HTTP compressionCapability that can be built into web servers and web clients
- HTTP ETagCommunications protocol
- HTTP handlerASP.NET process
- HTTP Live StreamingStreaming communications protocol
- HTTP locationInstruction by a web server containing the intended location of a web page
- HTTP parameter pollutionWeb security vulnerability
- HTTP persistent connectionUsing a single TCP connection to send and receive multiple HTTP requests/responses
- HTTP Public Key PinningObsolete Internet security mechanism
- HTTP refererHTTP header field
- HTTP request smugglingWeb security vulnerability
- HTTP/1.1 Upgrade headerHTTP header field introduced in HTTP/1.1
- HTTP/2Network protocol used by the Web
- HTTP/3HTTP network protocol introduced in 2022
- HTTPSHTTP extension supporting TLS encryption
- Huang's lawComputer science observation
- Hub CultureHub Culture is an invitation-led social networking service that operates its own digital c
- Huffman codingTechnique to compress data
- Hugging Face TransformersOpen-source deep learning library
- Hui LeiChinese-American computer scientist
- HuluAmerican video streaming service
- Human errorAction with unintended consequences
- Human resource management systemSoftware
- Human rights and encryptionUse of encryption technology to ensure human rights are maintained
- Human-centered designApproach to design that considers human needs at every step of development
- Human-in-the-loopSoftware user interface
- Human–AI interactionInteractions with artificial intelligence
- Human–computer interactionHuman–computer interaction (HCI) is the process through which people operate and engage wi
- Humor on the InternetThe history of humor on the Internet begins together with the Internet itself. Initially,
- Hunt–Szymanski algorithmIn computer science, the Hunt–Szymanski algorithm, also known as Hunt–McIlroy algorithm, i
- Hurricane ElectricGlobal telecommunications provider headquartered in California, United States
- HxDFree hex and disk editor
- Hy (programming language)Hy is a dialect of the Lisp programming language designed to interact with Python by trans
- Hybrid automatic repeat requestHybrid error-detection and correction code in communications
- Hybrid cloud storageHybrid cloud storage, in data storage, is a term for a storage infrastructure that uses a
- Hybrid cryptosystemConcept in cryptography
- Hybrid driveData storage device
- Hybrid fiber-coaxialTelecommunications industry term
- Hybrid kernelType of operating system kernel
- Hybrid log–gammaThe hybrid log–gamma (HLG) transfer function is a transfer function jointly developed by t
- Hybrid systemA hybrid system is a dynamical system that exhibits both continuous and discrete dynamic b
- Hybrid warfareTheory of military strategy
- Hydra (chess)Hydra was a chess machine, designed by a team with Dr. Christian "Chrilly" Donninger, Dr.
- Hyper-encryptionHyper-encryption is a form of encryption invented by Michael O. Rabin which uses a high-ba
- Hyper-threadingProprietary simultaneous multithreading implementation by Intel
- HyperlinkMethod of referencing visual computer data
- HyperLogLogHyperLogLog is an algorithm for the count-distinct problem, approximating the number of di
- HyperTalkProgramming language
- HypertextText with references (links) to other text that the reader can immediately access
- HyperTransportComputer processor interconnection technology first introduced in 2001
- HypervisorPiece of software or hardware that creates and runs virtual machines
- HyphanetPeer-to-peer Internet platform for censorship-resistant communication
- HyphySan Francisco Bay Area slang meaning "hyperactive"
- HypreThe Parallel High Performance Preconditioners (hypre) is a library of routines for scalabl