Google AdWords
  Audio Ads Placement
  Audio Advertising
  Video Advertising
  Constant Contact
  Search Engines
  Enhance
  EntireWeb
  Miva Precision
  Overture
  SureList
  Search123


 
 


How Web Search Engines Work

A Web search engine is an application tool designed to search for information on the World Wide Web. Information may consist of web pages, images, information and other types of files. Some search engines also mine data available in newsbooks, databases, or open directories. Unlike Web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.
history of search engines

A web search engine crawls, indexes and searchs based on request. Web search engines work by storing information about many web pages, which they retrieve from the WWW itself. These pages are retrieved by a Web crawler (sometimes also known as a spider) — an automated Web browser which follows every link it sees. Exclusions can be made by the use of robots.txt. The contents of each page are then analyzed to determine how it should be indexed (for example, words are extracted from the titles, headings, or special fields called meta tags). Data about web pages are stored in an index database for use in later queries. Some search engines, such as Google, store all or part of the source page (referred to as a cache) as well as information about the web pages, whereas others, such as AltaVista, store every word of every page they find. This cached page always holds the actual search text since it is the one that was actually indexed, so it can be very useful when the content of the current page has been updated and the search terms are no longer in it.

When a user enters a search request (search keyword or phrase) into a search engine, the engine examines its index and provides a listing of best-matching web pages according to its criteria.

The usefulness of a search engine depends on the relevance of the result set it gives back. While there may be millions of webpages that include a particular word or phrase, some pages may be more relevant, popular, or authoritative than others. Most search engines employ methods to rank the results to provide the "best" results first. How a search engine decides which pages are the best matches varies widely from one engine to another. The methods also change over time as Internet usage changes and new techniques evolve.

Most Web search engines are commercial ventures supported by advertising revenue and, as a result, some employ the practice of allowing advertisers to pay money to have their listings ranked higher in search results. Those search engines which do not accept money for their search engine results make money by running search related ads alongside the regular search engine results. The search engines make money every time someone clicks on one of these ads

A site to help you keep up with the world of search engines. Search Engines

p align="center">Checks and Forms Reseller Program
check and forms program
Checks and Forms Reseller Program


   
           

legal help  EGPSite  EGPShop  EGPCatalog  EGPWeb  EGPChecks  site map
computers and electronics  EGP Video  egp ink  EGP Business Solutions  international professional services directory
EGPeChecks

All trademarks are the property of their respective owners. 1993 -  ©Delta Technologies All rights reserved.

hosting by EgpHosting.com