Spiders play a large part in SEO. There are basically two types of search engines. The first is by robots called crawlers or spiders.
Search engines use spiders to index websites. When you submit your web pages to a search engine by completing their required submission page, the spiders of search engines index your site. A spider ‘,’ is an automated program that is run by the search engine system. Spider visits a web site, read the contents in the same place, site Meta tags and also follow the links that the site connects. The spider returns all that information back to a central repository where data is indexed. It will visit each link you have on your website and index those sites as well. Some spiders only index a certain number of pages on your site, so do not create a site with 500 pages! A search engine optimization agency will be able to get your site indexed better with the search engines.
The spiders periodically revisit sites to verify any information that has changed. The frequency with which this happens is determined by the moderators of the search engines.
A spider is almost like a book that contains the table of contents, content and links and references to all the websites it finds during its search, and can index up to a million pages a day.
Example: Google, Yahoo, and Bing
When you ask a search engine to locate information, it is actually searching through the index has been created and not actually searching the Web. Different search engines produce different rankings because not every search engine uses the same algorithm to search through the indices.
One of the things a search engine algorithm scans for is the frequency and location of keywords on your website, but they can also detect artificial keyword stuffing known as spamdexing. They also analyze algorithms for how pages link to other web pages. By checking how pages link to one another, an engine can determine page rank, if the keywords of the linked pages are similar to keywords in the original page. Talk to an SEO expert to know more about specific keyword amounts within a page.
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