HTML and DHTML
HTML
HyperText Markup Language. This is a file format, based on SGML, for hypertext documents on the Internet. It is very simple and allows for the embedding of images, sounds, video streams, form fields and simple text formatting. References to other objects are embedded using URLs.
DHTML
Not a language. It is a term describing the art of making dynamic and interactive web pages. It combines HTML, JavaScript, HTML DOM, CSS.