To understand search engine optimization, one must understand the basic critical operations that enable a search engine to present information to a user during a search. The first operation is called “crawling”- search engines run automated programs, usually called “bots” or “spiders” that literally crawl the Web via the hyperlink structure. Around eight to ten billion of the total twenty billion have been crawled to date. After the periodic crawl through the Web, the next critical operation is called the indexing, or storing in large databases. These indexes are managed a very, very efficient manner, because a search should only take fractions of a second to complete. The third critical operation is the processing of queries, where keywords of users are compared to the ones stored in the large databases, there are mainly two types of keywords, the ones the “Findall” mode and the ones who are not. After the processing, the pages to be displayed to the user are ranked, one the basis of relevance.

To make a site SEO-friendly, the following should be remembered and applied during the creation/origination of the web site or in its subsequent modifications. URLs with 2+ dynamic parameters may hinder spiders from crawling a page, because they often result in errors with visitors that are non-human. Also, websites that have more than a hundred unique links to other pages may not be crawled completely, given the kind of tight indexing that an efficient search should return to users. Web pages that require more than three links or clicks from the home page may also not be crawled, because they are already considered “deep” pages. Fourth thing to remember is that robot crawlers often are unable to index websites that require a Session ID or Cookie, because of the programs’ inability to retain these particular elements in the same way that a regular web browser would. Also, using frames for your website would mean that crawlers would be confused during the ranking of the pages, and may result in your frames being buried during results. There are other possible obstacles in the inclusion of your website in top results of search engines, and the first of these obstacles is making a page accessible only through a select form and a submit button. Crawlers generally do not perform other operations within a page, and if this is the case for your website, there is a chance that it might not be indexed. Second, if a page is available only through a drop-down HTML menu, again, crawlers would not be able to index properly. Same goes for websites that require first a log-in before the website’s full display. The last obstacle is making the website available only after re-directing. Search engines term this kind of website behavior as cloaking or bait-and-switching, and may cause the search engines to even ban your website from inclusion in any subsequent crawls. The main thing about making your web site SEO friendly is providing optimized keywords, and other than that, providing direct HTML links to the pages that you wish to be included in the crawl. Of course, web pages that have no link at all from the main web page will not be included.
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