XHTML (eXtensible HyperText Markup Language) is the W3C's new version of HTML. It is the reformulation of HTML 4.0 as an application of XML, containing a family of current and future document types and modules that reproduce and extend the capabilities of HTML. XHTML provides the framework for future extensions of HTML, with the aim of replacing HTML in the future.

• XHTML stands for EXtensible HyperText Markup Language
• XHTML is aimed to replace HTML
• XHTML is almost identical to HTML 4.01
• XHTML is a stricter and cleaner version of HTML
• XHTML is HTML defined as an XML application
• XHTML is a W3C Recommendation