How search engines work ?

Search engines are based on computer programs that explore the Net in search of webpages. They do this by using so-called "spiders," "crawlers," or "robots". Like any human surfer, the robots are able to follow the links present on webpages. When finding a new webpage, they copy all or parts of the text present on the page into their search engine database. Other spiders revisit these pages on a regular interval in order to register changes or dead links. The interval varies greatly from search engine to search engine and from site to site.

Ranking algorithm

The search engine will have billions of webpages in its database. In order to deliver relevant results, the search engine companies have developed special ranking algorithms that calculate the order of search query results. By a search query we mean the keyword or keyword phrase the visitor enters into the search form of the search engine. A special program analyzes the search query, and then searches the database for pages that contain this keyword or keyword phrase. Next it analyzes every single one of the relevant pages in order to determine how important that phrase is on that page. The pages the search engine find most relevant will be listed first. For instance, if you are searching for "Albert Einstein," and the search engine finds a main headline on that page containing the phrase "Albert Einstein," it will guess that this page is fairly relevant to your needs. If, on the other hand, it finds the phrase only once, buried in a long text, it will reckon it is less relevant.

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