search engine

The search engine is a computer program designed to help someone find the files that are stored in the computer, for example, in a public server on the web (WWW) or the computer itself. The search engine allows us to ask for media content with specific criteria (typically containing words or phrases that you specify) and obtain a list of files that meet these criteria. Search engines usually use the index (which was made before and updated on a regular basis) to find the file after the user enters a search criteria.

In the context of the Internet, search engine usually refers to the WWW, and not the protocol or other areas. In addition, search engine data available in newsgroups, large databases, or open directories like DMOZ.org. Because data collection is done automatically, unlike search engine web directory of human work.

Most search engines run by private companies using proprietary algorithms and closed databases - the most popular is Google (MSN Search and Yahoo! Left little behind). There have been several attempts to create search engines with open-source (open source), for example is Htdig, Nutch, Egothor and OpenFTS. [1]