A search engine is a computer software program that enables a user to find information in a database by searching for indexed keywords. A search term may include one or more words and may employ Boolean operators ("and," "or," "not") or other coding.
Search engines are the primary means of finding information on the World Wide Web and other portions of the Internet. Web search engines employ "spiders". These programs travel the Internet in search of Web pages. Spiders gather such information as a Web page's title, contents, and linked Web sites. They also capture terms included in metatags -the portion of the page's HTML coding where the author may add words to describe its contents.
Information culled by spiders is put into an index and matched to keywords. The creation of the index may be completely automated, or it may be done in part by hand. The index may accept submissions from site authors for inclusion among search results.
Competing search engines may provide different results for the same search term. This is because they send out spiders at different times and because they employ different algorithms to prioritize results. Reflecting the importance of Internet searches to e-commerce, many search engines allow advertisers to purchase listings at the top of search results, or to run text advertisements matched to search terms.
The first search engine, Archie, was created in 1990 by Alan Emtage at McGill University. Predating the World Wide Web, Archie employed anonymous File Transfer Protocol (FTP) servers to archive Internet file addresses.
Throughout the 1990s, several search engines, most created by individuals or small groups, appeared and were predominant until their technology or business model was surpassed. Yahoo!, developed in 1993, popularized human-made Web indexes.
Google was created in 1998 by two Stanford University students, Sergey Brin and Larry Page. By 2003 it was responsible for approximately three-fourths of all Internet search traffic. Google's rapid rise owed to its algorithm, which pushed to the top of its results Web pages linked to by other Web pages.
Accounting for about two-thirds of the searches conducted as of early 2014, Google continued to dominate Internet searching. Other popular search engines include Yahoo! and Microsoft's Bing, but no other search engine accounts for more than 20% of the searches executed.
Search engines are the primary means of finding information on the World Wide Web and other portions of the Internet. Web search engines employ "spiders". These programs travel the Internet in search of Web pages. Spiders gather such information as a Web page's title, contents, and linked Web sites. They also capture terms included in metatags -the portion of the page's HTML coding where the author may add words to describe its contents.
Information culled by spiders is put into an index and matched to keywords. The creation of the index may be completely automated, or it may be done in part by hand. The index may accept submissions from site authors for inclusion among search results.
Competing search engines may provide different results for the same search term. This is because they send out spiders at different times and because they employ different algorithms to prioritize results. Reflecting the importance of Internet searches to e-commerce, many search engines allow advertisers to purchase listings at the top of search results, or to run text advertisements matched to search terms.
The first search engine, Archie, was created in 1990 by Alan Emtage at McGill University. Predating the World Wide Web, Archie employed anonymous File Transfer Protocol (FTP) servers to archive Internet file addresses.
Throughout the 1990s, several search engines, most created by individuals or small groups, appeared and were predominant until their technology or business model was surpassed. Yahoo!, developed in 1993, popularized human-made Web indexes.
Google was created in 1998 by two Stanford University students, Sergey Brin and Larry Page. By 2003 it was responsible for approximately three-fourths of all Internet search traffic. Google's rapid rise owed to its algorithm, which pushed to the top of its results Web pages linked to by other Web pages.
Accounting for about two-thirds of the searches conducted as of early 2014, Google continued to dominate Internet searching. Other popular search engines include Yahoo! and Microsoft's Bing, but no other search engine accounts for more than 20% of the searches executed.
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