Search Engine Essentials
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What are Search Engines? There are numerous different search engines, and all are essentially huge databases containing information about web pages from the internet. A web-based user interface then allows the user to search the contents of this database. The user enters a search-term into the search engine and is presented with a list of web-pages that relate to the search-term. Note that search engine databases have separate records for each web-page, not each website.
Some well known search engines are:
All the Web
Although they function in essentially the same way, each search engine varies in the amount and type of information it stores about each web page and the way in which it 'decides' which pages relate to a particular search-term.
How Do Search Engines Work?
Spiders and Robots.
Search Engines gather information about Web Pages using automated software that 'crawls' through the World Wide Web visiting every web-page that it can find. This software is usually referred to as a 'robot' or a 'spider'. When an individual submits a website to a search engine they are requesting that a search engine robot is sent to that page. When a robots visits the page it records not just the URL of the page, but varying amounts of information about the page. The robot then follows every single hyperlink within the page and catalogues those pages, and on it goes following links throughout the internet, cataloguing every page it comes to. Once a web-page has been submitted to a search engine, or has links to it from pages that already get spidered by the search engine robots then there should be no need to re-submit the site to the search engines as the robots will come crawling on a regular basis.
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