What is CSS?

CSS standsrs for Cascading Style Sheets. CSS Styles are used to define how to display HTML elements. Styles are normally stored in internet or external style sheets. Styles were added to HTML 4.0 because developers disliked having to define every bit of text using tags like <font>. External CSS files are stored using the .css extention though they can be saved in HTML format. Multiple style definitions will cascade into one,

External style sheets can save you a lot of time, as you can change the look of the page, just by changing the external file. CSS Style Sheets are supported by both Nescape 4.0 and Internet Explorer 4.0.

CSS Orders
You may have multipul style sheets saying different things in your document. In this case they will be ordered in priority as follows:

1) Inline Style Sheets (inside an element)
2) Internal Style Sheets (inside the head tag)
3) External Style Sheets
4) Browser Default

So for instance an inline style tag would overrule and internal style sheet, but a browser default would not overrule an external style sheet.