Earlier search engines held an index of a few hundred thousand pages and documents, and received maybe one or two thousand inquiries each day. Today, a top search engine will index hundreds of millions of pages, and respond to tens of millions of queries per day.
How are the pages indexed? How do the search routines really work? Only the operators of the search engines know for sure, and this is generally very closely held proprietary information. The process is continually improved, as all useful computer software is.
Why certain pages are at the top of the list of results of certain searches, can help you out to gain good website optimization.
Using this information, you can make a reasonable determination of what techniques can be used to enhance a web site's visibility and effectiveness in the search engines.
Through an analysis of your existing or proposed web site, you can recommend and implement changes that can dramatically improve your site's chances of being found.
Some of these changes may alter the actual content of what is displayed on a page. Many of these changes, however, have no effect on what a user sees when visiting your site.
Earlier, old SEO Experts had very minimum options to learn and practice with the help of SEO Forums and very minimum number of experts articles and understanding the algorithms tactic was not so easy like now. And the only advantage was that there were minimum SEO Experts, so with basic knowledge of search engine optimization, many SEOs were able to survive in the industry.
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