Types of Css :
There are three types of CSS as mentioned below:

External : These are written in separate files.
Internal : These are cited at the top of the web page code document.
Inline : These are written right next to the text.


External :
External style sheet is very useful as we write all the styling codes in a single file and it can be used anywhere by just referring to the link of that external style sheet file.
So, if we do any changes in that external file, then the changes can also be observed on the webpage.
Thus we can say that it is very useful and it makes your work easy while working on larger files.