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- O(1) schedulerHistorical Linux 2.6 kernel process scheduler
- OAKSTARUS secret internet surveillance program
- OAuthMethod of user authentication in computing
- Oberon-2Oberon-2 is an extension of the original Oberon programming language that adds limited ref
- Obfuscation (software)Deliberate creation of difficult-to-understand code
- Object (computer science)Semantic instance with state, behavior, and identity
- Object codeSequence of statements or instructions in a computer language
- Object code optimizerAn object code optimizer, sometimes also known as a post pass optimizer or, for small sect
- Object databaseDatabase presenting data as objects
- Object fileFile containing relocatable format machine code
- Object hyperlinkingAttaching URLs tags to tanglible objects
- Object Management GroupComputer industry standards consortium
- Object resurrectionIn object-oriented programming languages with garbage collection, object resurrection occu
- Object storageComputer data storage architecture that manages data as objects
- Object-oriented analysis and designSoftware development methodology
- Object-oriented operating systemAn object-oriented operating system is an operating system that is designed, structured, a
- Object–relational mappingProgramming technique
- Objective-CGeneral-purpose, object-oriented programming language
- Oblique typeOblique type is a form of type that slants slightly to the right, used for the same purpos
- ObservabilityObservability is a measure of how well internal states of a system can be inferred from kn
- Observer patternSoftware design pattern based on an event-updated object with a list of dependents
- OCB modeAuthenticated encryption mode of operation for block ciphers
- OceanParcelsSet of python packages for Langragian ocean analysis
- Octet (computing)Unit of digital information
- Octuple-precision floating-point format256-bit computer number format
- Office Open XMLFamily of document file formats
- Offset printingPrinting technique
- Ofqual exam results algorithmEducation results algorithm used during the Covid-19 pandemic in England
- OGASSoviet internet-like project, automation of economy
- OggOpen container format by Xiph.Org Foundation
- Oh No They Didn'tGossip community on LiveJournal
- Okamoto–Uchiyama cryptosystemThe Okamoto–Uchiyama cryptosystem is a public key cryptosystem proposed in 1998 by Tatsuak
- OkCupidAmerican online dating service
- OLAP cubeAn OLAP cube is a multi-dimensional array of data. Online analytical processing (OLAP) is
- Old mediaMass media institutions before the Digital Age
- OLEDDiode that emits light from an organic compound
- Omnis StudioRapid application development tool
- On hold messagingTelephone marketing technique
- On the Internet, nobody knows you're a dogAdage and meme about internet anonymity
- On-premises softwareOn-premises software (abbreviated to on-prem, and often written as "on-premise") is instal
- On–off keyingOn–off keying (OOK) denotes the simplest form of amplitude-shift keying (ASK) modulation t
- One UIAndroid distribution
- One-hotBit-vector representation where only one bit can be set at a time
- One-shot learning (computer vision)Object categorization problem
- One-time padEncryption technique
- One-time passwordPassword that can only be used once
- One-way compression functionCryptographic primitive
- One-way functionFunction used in computer cryptography
- One-way quantum computerMethod of quantum computing
- OneDriveFile hosting and synchronization service operated by Microsoft
- OnePlusChinese consumer electronics manufacturer, a subsidiary of Oppo
- OnePlus NordAndroid-based smartphone produced by OnePlus
- OnePlus OneThe OnePlus One (colloquially abbreviated to OPO and also known as OnePlus 1) is an Androi
- OnePlus XThe OnePlus X is an Android smartphone developed by OnePlus. It was released on 29 October
- Ones' complementMathematics concept
- Online algorithmAlgorithm that begins on possibly incomplete inputs
- Online and offlineConnected or disconnected state for equipment and services
- Online auctionAuction held over the internet
- Online chatReal-time communication over the internet
- Online console gamingOnline console gaming involves connecting a console to a network over the Internet for ser
- Online content analysisOnline content analysis or online textual analysis refers to a collection of research tech
- Online datingRomantic relationships formed on the internet
- Online encyclopediaEncyclopedia accessible via the internet
- Online grocerFood store supporting online purchases
- Online helpInformation delivered via computer software
- Online identitySocial identity in an online community
- Online interviewMethod of online research
- Online machine learningMethod of machine learning
- Online marketplaceType of e-commerce site
- Online office suiteType of office suite software
- Online participationExtent to which the web encourages the people to share in organizational decision-making
- Online pharmacyPharmacy that operates over the Internet
- Online piracyIllegal use of digital copyrighted works
- Online predatorPerson who commits child sexual abuse via the Internet
- Online public relationsOnline public relations, also known as E-PR or digital PR, is the use of the internet to c
- Online research methodsWays in which researchers collect data via the Internet
- Online Safety Amendment (Social Media Minimum Age) Act 2024Australian legislation
- Online trading communityAn online trading community provides participants with a structured method for trading, ba
- Online transaction processingType of database system
- Ontology (information science)Specification of a conceptualization
- Ontology engineeringField that studies the methods and methodologies for building ontologies
- Ontology languageIn computer science and artificial intelligence, ontology languages are formal languages u
- Ontology learningAutomatic creation of ontologies
- OPC Unified ArchitectureOPC Unified Architecture (OPC UA) is a cross-platform, open-source, IEC62541 standard for
- OpcodePart of a machine instruction
- Open access in IndiaIn India, the Open Access (उन्मुक्त अभिगम) movement started in 2001 with the launch of Jou
- Open Base Station Architecture InitiativeTrade association
- Open dataOpenly accessible data
- Open data in FranceOnline access to legal information was implemented in France in 1999 and complemented in 2
- Open Database ConnectivityODBC, standard interface for accessing database systems
- Open Document ArchitectureThe Open Document Architecture (ODA) and interchange format (informally referred to as jus
- Open file formatPublished specification for storing digital data
- Open knowledgeOpen knowledge (or free knowledge) is knowledge that is free to use, reuse, and redistribu
- Open mail relaySMTP server that allows anyone to send e-mail through it
- Open Network for Digital CommerceIndian public non-profit organisation
- Open Shortest Path FirstRouting protocol for IP networks
- Open sourcePublishing digital resources with their source files
- Open standardStandard that is openly accessible and usable by anyone
- Open Telecom PlatformOTP is a collection of useful middleware, libraries, and tools written in the Erlang progr
- Open Transport NetworkOpen Transport Network (OTN) is a flexible private communication network based on fiber op
- Open weightsPublic availability of AI parameters
- Open-source artificial intelligenceConcept of open-source software applied to AI
- Open-source hardwareHardware whose design source files are made available
- Open-source intelligenceData collected from publicly available sources to be used in an intelligence context
- Open-source licenseSoftware license allowing source code to be used, modified, and shared
- Open-source political campaignOpen-source political campaigns, open-source politics, or Politics 2.0, is the idea that s
- Open-source software movementOpen collaboration movement supporting open-source licenses
- Open–closed principleConcept in object-oriented programming
- OpenAI o12024 AI LLM with enhanced reasoning
- OpenAI OperatorDiscontinued AI agent
- OpenAI–HuggingFace incidentLoss-of-control incident at OpenAI
- OpenBSDOperating system
- OpenBSD Cryptographic FrameworkCryptographic software in OpenBSD
- OpenCVComputer vision library
- OpenDNSDomain name system provided by Cisco
- OpenDNSSECOpenDNSSEC is a computer program that manages the security of domain names on the Internet
- OpenGLCross-platform graphics API
- OpenIDOpen and decentralized authentication protocol standard
- OpenJ9Eclipse OpenJ9 (previously known as IBM J9) is a high performance, scalable, Java virtual
- OpenJS FoundationThe OpenJS Foundation is an organization that was founded in 2019 from a merger of JS Foun
- OpenNet InitiativeInternet surveillance monitoring project
- OpenPOWER FoundationIndustry organization that manages Power ISA
- OpenreachInfrastructure subsidiary of BT
- OpenSolaris for System zOpenSolaris for System z is a discontinued port of the OpenSolaris operating system to the
- OpenSSHSet of computer programs providing encrypted communication sessions
- OpenSSLImplementation of SSL and TLS protocols
- OpenTypeComputer font file format
- OpenURLStandardized format for linking to information resources
- OpenVMSComputer operating system
- OpenVPNFree and open-source virtual private network software
- OpenweightOpenweight, also known as Absolute, is an unofficial weight class in combat sports and pro
- Opera (web browser)Free web browser
- Operating temperatureTemperature range in which the equipment is expected to function reliably
- Operation D-EliteFederal operation against torrent tracker site
- Operation Shrouded HorizonOperation Shrouded Horizon was an 18-month international law enforcement investigation cul
- Operation StackOperation Stack was a procedure used by Kent Police and the Port of Dover in England to pa
- Operation TovarOperation Tovar was an international collaborative operation carried out by law enforcemen
- Operational amplifierHigh-gain voltage amplifier with a differential input
- Operational semanticsCategory of formal programming language semantics
- Operations Support BranchCyber-intelligence unit of the CIA
- Operations support systemSystems used to manage telecommunication networks
- Operations, administration, and managementOperations, administration, and management or operations, administration, and maintenance
- Operator (computer programming)Basic programming language construct
- Operator assistanceCall assistance services
- Operator associativityProperty determining how equal-precedence operators are grouped
- Operator overloadingFeature of some programming languages
- Operator-precedence grammarAn operator precedence grammar is a kind of grammar for formal languages.
- Operator-precedence parserBottom-up parser that interprets an operator-precedence grammar
- Opportunistic encryptionProcess in which digital operating systems attempt to encrypt communications channels
- Opt-outThe term opt-out refers to several methods by which individuals can avoid receiving unsoli
- Opte ProjectRepresentation of the breadth of the Internet using visual graphics
- OpteronServer and workstation processor line by AMD
- Optical character recognitionComputer recognition of visual text
- Optical communicationUse of light to convey information
- Optical computingComputer that uses photons or light waves
- Optical disc driveType of computer disk storage drive
- Optical fiber connectorDevice used to join fiber optic strands in communication systems
- Optical head-mounted displayAn optical head-mounted display (OHMD) is a wearable device that has the capability of ref
- Optical mouseType of computer mouse
- Optical networkingMeans of communication using light
- Optical recordingThe history of optical recording can be divided into a few number of distinct major contri
- Optical storageMethod to store and retrieve computer data using optics
- Optical telegraphTower-based signaling network
- Optical transport networkStandard for optical data packages
- OPTICS algorithmAlgorithm for finding density based clusters in spatial data
- Optimal asymmetric encryption paddingScheme often used with RSA encryption
- Optimal matchingOptimal matching is a sequence analysis method used in social science, to assess the dissi
- Optimization problemProblem of finding the best feasible solution
- Optimizing compilerCompiler that optimizes generated code
- OR gateDigital logic gate type
- OR-AND-invertOR-AND-invert gates or OAI-gates are logic gates comprising OR gates followed by a NAND ga
- Oracle CloudCloud computing service
- Oracle DatabaseProprietary database management system
- Oracle Enterprise ManagerComputer management tools
- Oracle Intelligent AdvisorAutomation software products
- Oracle RdbRelational database management system
- Oracle SolarisUnix operating system originally developed by Sun Microsystems
- Oral history preservationOral history preservation is the field that deals with the care and upkeep of oral history
- Orange (software)Open-source data analysis software
- Orange MoroccoMoroccan Internet provider and mobile network
- Origins of global surveillanceThe origins of global surveillance can be traced back to the late 1940s, when the UKUSA Ag
- Orthogonal frequency-division multiple accessMulti-user version of OFDM digital modulation
- OS X El Capitan2015 operating system version
- OS X Lion2011 operating system version
- OS X Mavericks2013 operating system version
- OS X Yosemite2014 operating system version
- OS/2Operating system from IBM
- OS/360 and successorsOperating system for IBM S/360 and later mainframes
- OS/390OS/390 is an IBM operating system for the System/390 IBM mainframe computers.
- OS/VS1Operating System/Virtual Storage 1, or OS/VS1, is a discontinued IBM mainframe computer op
- OS/VS2 (SVS)Single Virtual Storage (SVS) refers to Release 1 of Operating System/Virtual Storage 2 (OS
- OSCAR protocolInstant messaging and presence information protocol
- OSF/1OSF/1 is a variant of the Unix operating system developed by the Open Software Foundation
- Osnat PennIsraeli computational biologist
- Otakar BorůvkaOtakar Borůvka (10 May 1899 – 22 July 1995) was a Czech mathematician. He is best known fo
- Otway–Rees protocolThe Otway–Rees protocol is a computer network authentication protocol designed for use on
- Outlook.comMicrosoft webmail service
- Output devicePiece of computer hardware
- Output power of an analog TV transmitterElectrical power applied to the antenna system in a transmitter station
- Over-the-air updateWireless delivery of software updates
- Over-the-top media serviceService delivering video and audio over the Internet
- Overlapping distribution methodThe Overlapping distribution method was introduced by Charles H. Bennett for estimating ch
- Overlay networkComputer network built on top of another network
- OversamplingIn signal processing, oversampling is the process of sampling a signal at a sampling frequ
- Oversight Board (Meta)Appellate body of Facebook
- Özalp BabaoğluÖzalp Babaoğlu (born August 10, 1955, in Ankara, Turkey), is a Turkish computer scientist.