The key to comprehension of importance of CSS lays in understanding that HTML was never intended to stylize and format web pages. It was created to describe the content of web document. Attempts to use HTML for stilization is a huge mistake and leads only to complication of development process. Read more about advantages of CSS here.
- CSS (Cascading Style Sheets) is a style sheet language used to set the visual style of web pages.
- There is a lot of advantages in usage of CSS and separating visual styles from HTML content.