DHTML stands for Dynamic Hypertext Markup Language, which is a combination of HTML, CSS, and JavaScript. It is not a markup or programming language but a term that combines the features of various web development technologies for creating dynamic and interactive web pages. DHTML allows scripting languages to change variables in a web pages definition language, which in turn affects the look and function of otherwise "static" HTML page content after the page has been fully loaded and during the viewing process.

DHTML is not a technology in and of itself; rather, it is the product of three related and complementary technologies: HTML, Cascading Style Sheets (CSS), and JavaScript. To allow scripts and components to access features of HTML and CSS, the contents of the document are represented as objects in a programming model known as the Document Object Model (DOM).

Some key features of DHTML include:

• Tags and their properties can be changed using DHTML.
• It is used for real-time positioning.
• Dynamic fonts can be generated using DHTML.
• It is also used for data binding.
• It makes a webpage dynamic and can be used to create animations, games, and applications along with providing new ways of navigating through websites.

DHTML is used to create dynamically changing websites and enhance the functionality of a webpage due to the usage of low-bandwidth effect by DHTML. It also facilitates the use of methods, events, properties, and codes.

In summary, DHTML is a combination of HTML, CSS, and JavaScript that allows scripting languages to change variables in a web pages definition language, which in turn affects the look and function of otherwise "static" HTML page content after the page has been fully loaded and during the viewing process. It is used to create dynamic and interactive web pages, animations, games, and applications.