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Through Google, Search engine and Social network

The search engine has gone through many updates in attempts to eradicate search engine optimization.

The name Google is a misspelling of Googol, the number 1 followed by 100 zeros, which was picked to signify that the search engine was intended to provide large quantities of information.

BackRub

Google has its origins in BackRub, a research project started in 1996 by Larry Page and Sergey Brin when they were both PhD students at Stanford University in Stanford, California. The project initially involved an unofficial "third founder", lead programmer Scott Hassan, who left before Google was officially founded as a company.

While finding a topic for his doctoral thesis in 1995, Page considered exploring the mathematical properties of the World Wide Web by understanding its link structure as a huge graph. His supervisor, Terry Winograd, encouraged him to pick this idea (which Page later recalled as "the best advice I ever got"). Page focused on the problem of finding out which web pages link to a given page, comparing the importance of tracking such backlinks to the role of citations in academic publishing. Page told his ideas to Hassan, who began writing the code to implement Page's ideas.

The research project was nicknamed BackRub, and it was soon joined by Brin, who was supported by a National Science Foundation Graduate Fellowship. The two had first met in the summer of 1995, when Page was part of a group of potential new students that Brin had volunteered to give a tour around the campus and nearby San Francisco. Both Brin and Page were working on the Stanford Digital Library Project (SDLP), whose goal was "to develop the enabling technologies for a single, integrated and universal digital library". The SDLP was funded through U.S. federal agencies including the National Science Foundation. Brin and Page also received funding from Massive Digital Data Systems (MDDS), a program by the Central Intelligence Agency (CIA) and the National Security Agency (NSA) to fund the improvement of intelligence databases on the disorganized World Wide Web.

Page's web crawler began exploring the web in March 1996, with Page's own Stanford home page serving as the only starting point. Brin and Page developed the PageRank algorithm to convert the backlink data they gathered for a given web page into a measure of importance. The pair realized that a search engine based on PageRank would produce better results than existing search engines, which ranked results according to how many times the search term appeared on a page.

Convinced that the pages with the most links to them from other highly relevant Web pages must be the most relevant pages associated with the search, Page and Brin tested their thesis as part of their studies and laid the foundation for their search engine. The first version of Google was released in August 1996 on the Stanford website and used nearly half of Stanford's entire network bandwidth.

Some Rough Statistics (from August 29, 1996)

Total indexable HTML urls: 75.2306 Million

Total content downloaded: 207.022 gigabytes

...

BackRub is written in Java and Python and runs on several Sun Ultras and Intel Pentiums running Linux. The primary database is kept on a Sun Ultra II with 28GB of disk. Scott Hassan and Alan Steremberg have provided a great deal of very talented implementation help. Sergey Brin has also been very involved and deserves many thanks.

— Larry Page

Scott Hassan and Alan Steremberg were cited by Page and Brin as being critical to the development of Google. Rajeev Motwani and Terry Winograd later co-authored with Page and Brin the first paper about the project, describing PageRank and the initial prototype of the Google search engine, published in 1998. Héctor García-Molina and Jeff Ullman were also cited as contributors to the project.

PageRank was influenced by a similar page-ranking and site-scoring algorithm earlier used for RankDex, developed by Robin Li in 1996. Larry Page's patent for PageRank filed in 1998 includes a citation to Li's earlier patent. Li later went on to create the Chinese search engine Baidu in 2000.

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