A program that searches documents for specified keywords and returns a list of the documents where the keywords were found. Although search engine is really a general class of programs, the term is often used to specifically describe systems like Alta Vista and Excite that enable users to search for documents on the World Wide Web and USENET newsgroups.
Typically, a search engine works by sending out a spider to fetch as many documents as possible. Another program, called an indexer, then reads these documents and creates an index based on the words contained in each document. Each search engine uses a proprietary algorithm to create its indices such that, ideally, only meaningful results are returned for each query.
How it works
The method for finding this information is usually done by maintaining indices of Web resources that can be queried for the keywords entered by the user.
A search engine generally includes features such as Boolean operators, search fields, display format, etc.
A search engine generally includes features such as Boolean operators, search fields, display format, etc.
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