There are three methods to integrate CSS on web pages.
1. Inline method (or) CSS
2. Internal method (or) CSS
3. External method (or) CSS
Inline css : The css which is written in the tags in the body of html documents is called Inline css.
Internal css : The css which is written internally within the html document in the head tag is called Internal css.
External css : The css which is written externally and it is linked within head tag is called External css.