Search Enginges
A search engine is an information retrieval system designed to help find information stored on a computer system, such as on the World Wide Web, inside a corporate or proprietary network, or in a personal computer. The search engine allows one to ask for content meeting specific criteria (typically those containing a given word or phrase) and retrieves a list of items that match those criteria. This list is often sorted with respect to some measure of relevance of the results. Search engines use regularly updated indexes to operate quickly and efficiently.
Without further qualification, search engine usually refers to a Web search engine, which searches for information on the public Web. Other kinds of search engine are enterprise search engines, which search on intranets, personal search engines, and mobile search engines. Different selection and relevance criteria may apply in different environments, or for different uses.
Some search engines also mine data available in newsgroups, databases, or open directories. Unlike Web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.
| Top U.S. Search Providers by Searches, May 2007: | ||
| Provider | Searches (000) | Share of Total Searches (%) |
|---|---|---|
| 4,033,277 | 56.3 | |
| Yahoo | 1,540,949 | 21.5 |
| MSN/Windows Live | 605,400 | 8.4 |
| AOL | 381,961 | 5.3 |
| Ask.com | 142,418 | 2.0 |
| My Web Search | 61,784 | 0.9 |
| Comcast | 34,908 | 0.5 |
| EarthLink | 33,461 | 0.5 |
| My Way | 30,122 | 0.4 |
| Dogpile.com | 26,295 | 0.4 |
| Other | 275,365 | 3.8 |
| All search | 7,165,940 | 100.0 |
| Source: Nielsen//NetRatings, 2007 |
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