It is the search engines that finally bring your website to the notice of the prospective users. Hence it is better to know how these search engines actually work and how they present information to the customer initiating a search. So, 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 website pages to a search engine by completing their required submission page, the search engine spider will index your entire site. A ‘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, the site's Meta 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 you have on your website and index those sites as well. Some spiders will only index a certain number of pages on your site, so don’t create a site with 500 pages! 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 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. For Example: Google, yahoo, Excite, Lycos and AltaVista. Then, when you ask a search engine to locate for information, it is actually searching through the index which it has created and not actually searching the Web. This is because different search engines produce different rankings because not every search engine uses the same 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. It can also detect 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 determine what a page is about, if the keywords of the linked pages are similar to the keywords on the original page from the Internet. When you need to know about a particular subject, how do you know which pages to read? If you're like most people, you visit an Internet search engine. Here is a list of the most popular Search Engines and directory companies: Search Engines Go.com/InfoSeek AltaVista Google, HotBot Excite/Webcrawler Directories AOL Search Inktomi Lycos Open Directory MSN, Yahoo! LookSmart Snap Apart from the above there are thousands of search engines and directory companies, where you can submit your website to as many companies as possible.