What is W3C validation?

[grofee]

W3C validation is the free service which helps in checking out the validity of the web documents. These are the services that allows internet users to check the HTML and XHTML documents for well formed markups. In this, the user will get the surety of their website that whether it is up to the coding standard which is setup by world wide web consortium or not.

[Akshay_M]

This validator can process documents written in most markup languages. Supported document types include the HTML and XHTML, MathML, SMIL and SVG. As for every computer language, these have their own grammar, vocabulary, and syntax, and every document written with these languages are supposed to follow these rules.