DHTML is all-in-one word for web pages that uses HTML(Hyper Text Markup Language), CSS(Cascading Style Sheets) and rely on Java Scripts to make the web page interactive. It is a feature of Netscape Communicator 4.0, and Microsoft Internet Explorer 4.0 and is entirely a "client-side" technology. It relies only the browser for the display and manipulation of the web pages and is unrelated to other client-side technologies like Java, Flash.
DHTML excels in creating low-bandwidth effects that enhance a web page's functionality. It can be used to create animations, games, applications, provide new ways of navigating through web sites, and create out-of-this world page layouts that simply aren't possible with just HTML. Although many of features of DHTML can be duplicated with either Flash or Java, DHTML provides an alternative that does not require plugins and embeds seamlessly into a web page.