PHP is a server-side, HTML embedded scripting language used to create dynamic Web pages. Because PHP is embedded within tags, the author can jump between HTML and PHP (similar to ASP and ColdFusion) instead of having to rely on heavy amounts of code to output HTML. PHP can perform any task that a CGI program can perform, but its strength lies in its compatibility with many types of databases. PHP is the #1 add on module for Apache servers, and best of all -- it's free