CSS stands for Cascading Style Sheets. It is a language designed to specify the overall appearance of webpages as well as the appearance and structure of the text and elements such as images and buttons on webpages and their layout. Styles can be specified with CSS using internal style sheet definitions which are placed right into HTML/XHTML code or in external files.
The tutorials in this section included information on a variety of CSS topics including creating stylesheets, associating styles with specific HTML elements, setting background & text color, styling lists, setting the width & height of elements, media types, and more.
At this point you should at the very least be familiar with building webpages (HTML/XHTML), and styling them (CSS).