Dynamic web content is information that is delivered to the Web browser in a different form than it exists on the server. It is usually pulled from a database and created on the fly at the server level through CGI programming, ASP, PHP, or by a content management system.
Keyword research is an essential step in web site optimization. Why to find phrases rather then words? Only relevant keyword phrases can drive highly targeted traffic to your web site. Moreover, it should be remembered that generally single word keywords are very competitive.