CSS in Dreamweaver MX

I bought a Dreamweaver book , there is lots of inf about CSS but there is no explanation what CSS is except CSS = Cascarding Style Sheet . So , could S.O show me wat is CSS ?
Thanks alot :(

CSS simplifies and globalizes some familiar tags used in html, especially text formats, for instance, size, color, fonts, etc.

There are other cool features of it as well. You can change the scrollbar color (check out this forums scrollbar color color --> )

You can use it for aligning content. You can position any element in a web page.

Go check out this site:
www.bluerobot.com
and also hit the link that will turn css off and see what the difference is.

There is a lot you can do with it. It is the best friend to html, and it is really simple.

So keep looking into it.

Basically if you open up notepad and use the css tags, you can save it with the .css extension, import or link it to your page and it will take effect.

That really helps me , thanks