In CSS, you can add comments to explain your code or temporarily disable certain styles. CSS comments are ignored by the browser and won't be displayed on the web page. There are two ways to add comments in CSS:
1. Single-line comment: Use `/*` to start the comment and `*/` to end it. Everything between these symbols will be treated as a comment.
```css
/* This is a single-line comment */
```
2. Multi-line comment: You can use the same `/*` and `*/` symbols for multi-line comments as well.
```css
/*
This is a multi-line comment.
It can span multiple lines until it's closed with */
*/
```
Comments can be helpful for yourself or other developers who read and maintain your CSS code, as they provide insights and explanations about the code's purpose or specific sections.
