CSS stands for Cascading Style Sheet. It is a Style Sheet Language. In CSS3 Digit 3 is showing version of CSS.
If you want to describe the Look and Formatting of a document written in a markup language than definitely go with CSS3. Every content generated from any resource loaded in the Web browser converted into HTML and it can be designed by CSS.
CSS3 contains such great features which is very much needed to understand the Designing takes place in loading content in such environment like wise web browser with proper compatibility modes.
Start using it… Great for Beginner Developers…