A reformulation of HTML 4.01 in XML. Being XML means that XHTML can be viewed, edited, and validated with standard XML tools. At the same time, it operates as well as or better than HTML 4 in existing HTML 4 conforming user agents; Extensible Hypertext Markup Language
XHTML is an offshoot of HTML.
by illEATurHARTout April 02, 2004