These are the search engines that finally bring your website to the notice of potential customers. Therefore, it is better to know how these search engines actually work and how the information they receive from customers to initiate a search.
There are basically two types of search engines. The first is by robots called crawlers or spiders.
Search engines use spiders to index websites. If your web pages into a search engine by clicking on the template page of the spiders of search engines to index your site. A “spider” is an automatic, which search engine system. Spider visits a web site, please read the contents of the current page, the page Meta tags and follow the links that the site connects. The spider, then all this information back to a central repository where data is indexed. Will visit each link to your site and index pages as well. Some spiders only index a certain number of pages on your site, so that there is a page with 500 pages!
Spider periodically revisits sites to verify all 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 where the content and links and references for all sites during their search, and possibly up to one million pages per day.
Example: Excite, Lycos, AltaVista and Google.
If you use a search engine to obtain information, it is actually searching the index is created and not search the web. Different search engines different rankings because not every search engine uses the same algorithm to search through the in dices.
One of the things that a search engine algorithm is looking for is the frequency and location of keywords on a Web page, but can also detect artificial keyword stuffing or spamming. Then the algorithms analyze the way the pages contain links to other websites. Checking how pages link to each other, the engine can also determine what a page, if the keywords of the content of linked pages are similar to keywords in the original page.
