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Search engines provide an interface to a group of items that enables users to
specify criteria about an item of interest and have the engine find the matching
items. The criteria are referred to as a search query. In the case of text search
engines, the search query is typically expressed as a set of words that identify the
desired concept that one or more documents may contain.
There are several styles of search query syntax that vary in strictness.
Where as some text search engines require users to enter two or three words
separated by white space, other search engines may enable users to specify entire
documents, pictures, sounds, and various forms of natural language. Some search engines
apply improvements to search queries to increase the likelihood of providing a quality
set of items through a process known as query expansion.
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