In today's online world, your website does not mean anything to anyone unless it can be found by your customers. Optimizing your site so it appears high in the search engines seems to be as much as an art form, as it is a science. The act of altering a web site so that it does well in the organic, crawler-based listings of search engines.
Search engines use programs called spiders or crawlers that visit the pages of your Web site and index the information on those pages. This includes the content that your visitors see when viewing your page and some of code used to build your page.