Can somebody please explain What is the difference between CSS and CSS3?

Answer 1

There's no difference. Just like HTML and HTML 5. CSS 3 is simply the latest 'version' of CSS which has more advanced features than earlier 'releases'.

Answer 2

CSS3 is the latest version of CSS2, so of CSS in general.
Thanks to CSS3 our/my life become easier!
The biggest difference between CSS2 and CSS3 is that CSS3 has been split up into different sections, called modules.
Because each of the modules is being worked on individually, we have a much wider range of browser support for CSS3 modules.
We have now:
* New Combinator
* New CSS Selectors
* New Pseudo-elements
* New Style properties

There are so many things!