CSS stands for Cascading Style Sheets. Basically, CSS is a language that manages the design and presentation of web pages -- the way things look. It works together with HTML, or HyperText Markup Language, which handles the content of web pages. With CSS you can create rules to tell your website how you want it to display information. And you can keep the commands for the style stuff -- fonts, colors, and so on -- separate from the commands for the content. They’re called “cascading” because you can have multiple style sheets, with one style sheet inheriting properties (or “cascading”) from others.