Even if your site has been programmed in pure, easy to read HTML, you may not be presenting the spider with the appropriate information. Title, H1, and Meta tags are all important elements in effective code writing. Search engines rely on specific code to determine the content within a Web page.
Database-driven Websites present yet another obstacle for search engine spiders. Without proper search engine optimization, much of your site may be unreadable to search engines. This can have a significant adverse impact on your sites ability to generate search engine traffic.