Which benefits will CSS give me?

CSS was a revolution in the world of web design. The concrete benefits of CSS include:

• control layout of many documents from one single style sheet;
• more precise control of layout;
• apply different layout to different media-types (screen, print, etc.);
• numerous advanced and sophisticated techniques.

What is the difference between CSS and HTML?

HTML is used to structure content. CSS is used for formatting structured content.