What and how Spiders work ?
A search engine spider is an automated program that is run by the search engine system. Spider visits a web site, read the content on the actual site includes the site's Meta tags , Title tags and all HTML tags and also follow the links that the site connects. The spider then returns all that information back to a central depository, where the data is indexed. It will visit each link (except the rel="nofollow") links you have on your website and index those sites as well.
Search Engines use spiders to index websites. When you submit your website pages to a search engine like google , Yahoo , MSN by completing their required submission page, the search engine spider will index your entire site.
The spider will periodically return to the sites to check for any information that has changed. The frequency with which this happens is determined by the moderators of the search engine.
A spider is almost like the table of contents, the actual content and the links and references for all the websites it finds during its search, and it may index up to a million pages a day.
When you query a search engine to find information, it is actually searching through the database which it has created and not actually searching the Web. Different search engines produce different rankings because not every search engine uses the same algorithm and database to search through the indices.
One of the most important things that a search engine algorithm scans for is the frequency and location of keywords on a web page, but it can also detect artificial keyword stuffing. Then the algorithms analyze the way that pages link to other pages in the Web. By checking how pages link to each other, an engine can both determine what a page is about, if the keywords of the linked pages are similar to the keywords on the landing page.
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