Webmasters and content providers began optimizing sites for search engines in the Link Building Services mid-1990s, as the first search engines were cataloging the early Web. Initially, all a webmaster needed to do was submit a page, or URL, to the multifarious engines which would send a spider to "crawl" that page, extract links to other pages from it, and return clue found on the page to be indexed.
Some search engines have also reached out to the SEO industry, and are frequent sponsors and guests at SEO conferences and seminars. In fact, with the advent of paid inclusion, some search engines now have a vested activity in the health of the optimization community. Considerable search engines provide enlightenment and guidelines to aid with site optimization.