SEO: How Search Engines Work.

Don´t desregard that there are millions of factors that provide to the way search engines perform, and many of them are well-kept secrets. Google, the biggest search engine, holds parts of their operation under wraps to block fraud and dishonesty.

Web Spiders and Bots

In the history of the world wide web, a blog would often have to be submitted directly to a search engine in order for listing on that one. This was practically the exclusive way to obtain a listing on a site like Yahoo! due to directory listing sites depended on real editors to select the topics and contents of directory listings. Some search engines had rudimentary ways to search pages on the Internet. The problem is that these hadn't yet developed the ability to filter results very well. By using a search engine, the user couldn't be assured that he or she would even come upon pages related to the keywords typed into the search engine.

On the other hand, at present, no submission is necessary in order to be listed in search engines. Because technology has evolved, search engine listings are much more refined and certainly more user-friendly. Today's search engines spend lots of time, money and research in order to give a searching service that will give the user the best web experience possible. In fact, the search engine business model relies upon this fact. The more people that uses a search engine, the more web traffic that site will receive. The more web traffic, the more people will see advertising on that search engine. Since search engines frequently rely upon advertising to support the site, this works out for everyone. The user gets better search results and the search engine gets more users to their site.

What´s the way search engines provide an improved web experience for their audience? One technology development that has improved the typical web search is the spider or bot. A web spider is a program run by the engine. Instead of relying on the slow speed of a human editor, search engines can now rely on computer programs that never need to stop searching websites on the Internet. The unique scope of these programs is to "crawl" the web all day, every day. These computer programs are, in essence, looking over every single website they encounter. These programs search through websites, checking links, and examining keywords. The spiders will also look at HTML elements within the pages like page descriptions, meta tags, and page titles. Basically, these spiders are used to compile a large amount of data from webpages on the web. Here is a list of components within a website that are scanned by those spiders:

•	Text within the website •	Links within the website •	Page descriptions embedded within HTML •	Keywords embedded within HTML •	Photos and photo descriptions and alternate text

All of this information is then assemble into a series of databases maintained by the SE. This database is what eventually helps SE visitors find the data they want. When a user goes to a search engine and searches for the term "kittens," the search engine will then go to the database of all indexed information. The search engine will look for the keyword "kittens" within all of those databases, and then presents this information to the user. In order to give the best results to the user, the search engine will also sort this data by relevancy, putting the sites that are most related to the keyword or words at the top of the listing. By "indexing" all these sites, including their links and keywords, they can then provide a rank for each of these pages.

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