The list of items that meet the criteria specified by the query is typically sorted, or ranked. Query understanding methods can be used as standardized query 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. Whereas 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. It can also switch names within the search engines from previous sites. There are several styles of search query syntax that vary in strictness. 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. The criteria are referred to as a search query. 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 most public, visible form of a search engine is a Web search engine which searches for information on the World Wide Web. Online search engines store images, link data and metadata for the document as well. The crawler traverses a document collection, deconstructs document text, and assigns surrogates for storage in the search engine index.
A search engine normally consists of four components, as follows: a search interface, a crawler (also known as a spider or bot), an indexer, and a database. The search results are usually presented in a list and are commonly called hits.
#Boolean search engine website software
It is an information retrieval software program that discovers, crawls, transforms, and stores information for retrieval and presentation in response to user queries.
( Learn how and when to remove this template message)Ī search engine is an information retrieval system designed to help find information stored on a computer system. Please help improve this article by introducing citations to additional sources.įind sources: "Search engine" computing – news Relevant discussion may be found on the talk page. This article relies largely or entirely on a single source.
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