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Mark-up Languages
HTML
HTML (Hypertext Mark-up Language) is the language used to write or structure Web documents. HTML is in other words concerned with the display of web document.
XHTML
XHTML is an acronym for Extensible Hyper Text Mark-up Language. It is the successor of HTML. XHTML is more concerned about the structuring of web documents, while HTML is concerned with the display of the document.
XHTML is a hybrid between HTML and XML (extensible Mark-up Language). XML describes the structure of web pages. Not all browsers can display XML, and XHTML bridges this gap, because it can be displayed by both XML and HTML browsers.
XML
XML (extensible Mark-up Language) is a simple flexible text format developed by W3C. XML was developed to describe different types of data; it also allows the creation of custom tags.
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