HTML is used for the most basic forms of site. All HTML content is completely static in the sense that it cannot be modified without the intervention of the Webmaster. A Web site created in HTML and XHTML code is the best solution for Search Engine Optimisation (SEO). In this way the site is readily optimised and readable by search engines. Because of its basic nature, it is most frequently used in combination with other programming tools. This is not a suitable format if you need to change your site’s content regularly.