There are basically two manners of search engines. The first is by robots called crawlers or spiders.

Search Engines use spiders to index websites. When you submit your website pages to a search engine by completing their required capitulation page, the search engine spider mind indicator your entire site. A ?spider? is an automated program that is run by the search engine system. Spider sojourns a web stage, read the content on the unquestionable setting, the site's Meta marks and furthermore ensue the correlations that the stage connects. The spider then returns all that lore back to a central depository, where the data is indexed. It will visit each link you have on your website and symptom those sites as rootstock. Some spiders pleasure only index a certain number of pages on your site, so don't sire a site with 500 pages!

The spider pleasure periodically profit to the sites to stymie 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 savor a book where it contains 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.

Example: Move, Lycos, AltaVista and Google.

When you ask a frisk engine to locate information, it is actually searching through the symptom which it has created and not actually searching the Web. Different search engines produce different rankings because not every search engine uses the constant algorithm to search through the indices.

One of the things that a search engine algorithm scans for is the frequency and location of keywords on a web page, but it can also mind artificial keyword stuffing or spamdexing. 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 decide what a page is about, if the keywords of the linked pages are similar to the keywords on the basic page..