Many visits to websites now are as a result of a search made by a user. In fact you may be reading this very article as a result of using a popular search engine like Google or Yahoo. Traditionally, to make search engines of new content on your site that you might like to make visitors aware of, you had to wait for a visit from a Web Crawler, a program used by search engine companies that visits websites and analyses them to find out sort of information they contain. The problem with this is that you don't know how long you might have to wait for that Web Crawler to next pop round and share your new content with the world. Fortunately, this has now changed, and the big search engines have created a mechanism to update them with up to date content information about your site.