If you don't know what the term Google means, there's a leading internet search engine you can use to find out. Google offers targeted search results from billions of Web pages. Results are based on a proprietary algorithm; its technology for ranking Web pages is called PageRank. The firm generates revenue through ad sales. Advertisers deliver relevant ads targeted to search queries or Web content. The Google Network is a network of third-party customers that use Google's ad programs to deliver relevant ads to their own sites. In October 2015, Google formally became a part -- and by far the biggest part -- of the Alphabet Inc. holding company.