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Saturday, 13 August 2011

How Search Engines Work

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A search engine is more a tool than a website.It helps you find any content that it has indexed and kept in it's desk. So far i guess its been familiar terms, now lets get into the more technical stuff.

The search engines that we use mostly deal with the world wide web. The search engine uses 'spiders' to travel through the world wide web and reviews thousands of pages of websites,blogs,forums,etc. Then the spider indexes each page and keeps them in a suitable and easily retrievable order.(think of it like an attendance register)

The crawling by the spider mostly starts from a very busy and famous site. It then checks and follows all the links available on that site. It then keeps on following links in the sites it encounters , until it has almost traveled every nook and corner of the web. (like a 'spider' searching for 'prey' on it's 'web')

So when you search for a particular term or word, the search engine just has to check it's index and show you the required page.The main words are called 'keywords'. (kinda like you check the dictionary for meanings to a specific word).

So how does the search engine know which site is best and most relevant?? Well, the spiders give a particular  value to each word and then keeps count of how many times it appears in each page. That way they know how relevant it is to your search term and can give an appropriate 'rank' to the site.

Now you know how a search engine works :-)
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