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The Cascading Style Sheets are used to define the looks and behaviour of the information that we were laying down in the HTML portion of our pages. CSS is very powerful, and once you got around the (not very steep, it's really quite easy) learning curve, you will love CSS.
What can CSS do for us? After we layed down the ground work in HTML, giving the different kinds of information different names, we can easily define the looks of those information chunks in the CSS part. We have control over text color, borders around anything (the borders can have different colors on each side, or can be solid, dashed or dotted), background color, background images (including exact position or repeat), we can even change the behaviour of links (how it reacts when we move the mouse over a link for example). With the help of CSS we can design the very same page to have completely different looks, depending on which CSS is active - and then we might let the user choose what he prefers.
