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AdWords appears on the home screen.
The original idea was invented by Bill Gross of Idealab who, in turn, borrowed the idea from the model of the Yellow Pages. Google wanted to buy the idea but a deal could not be reached. Not wanting to give up on this form of advertisement, it launched its own solution, AdWords in 2000.
Google Groups appear.
In February 2001, Google acquired Deja News, an archive of messages posted to Usenet discussion groups. Its assets were transitioned to groups.google.com where users could access the newsgroups through the Google Groups interface
Google introduces its enterprise search feature - the 'Search Appliance'.
The appliance mapped all the web documents on the network accessible via hypertext transfer protocol (HTTP) in a process known as crawling, then creates an index of those documents.
It used PageRank to analyze the link structure of the network to determine the most important, highest quality pages across all sites. Then for each query, applied hypertext analysis using more than 100 variables to determine relevance.
It searched Microsoft Office documents, PDF, PostScript, and dozens of other file types.
Tabbed categories appeared above the search bar.