They automate time-consuming tasks that humans don't like to do, such as gathering database information or checking the validity of hypertext links. The search engine is one of the most useful aspects of the World Wide Web. Some of the major ones are InfoSeek, Alta Vista, Excite, Lycos, Webcrawler, and Yahoo. Some search engines find pages through robots that regularly crawl the Web, building databases of information on current pages. Others solely index items that have been submitted manually.
Many search engines use both methods.
Server Server is a generic term for hardware or software that provides services to clients on a network. A network file server gives users on a network access to shared hard-disk volumes. A World Wide Web server gives Internet users access to documents on that server's volume. A mail server distributes mail to individual users within a local area network. Payment of shareware fees is based on the honor system, although an increasing number of shareware programs allow use of the software for a short time, after which the software will fail to function unless the user pays for the software.