CSS comments are used to add explanatory or descriptive text within a CSS (Cascading Style Sheets) file. Comments are not displayed on the web page itself but serve as notes or reminders for developers or anyone reading the code. They are helpful for documenting your CSS code, explaining its purpose, or temporarily disabling certain styles without removing them completely.

CSS comments can be created using two different syntaxes :

1. Single-line comments: To create a single-line comment, you can use the double forward slash (//) followed by the comment text. Everything after the double slashes will be treated as a comment and will not affect the CSS styling.

css

.selector {
  property: value; // This is a single-line comment
}

2. Multi-line comments: Multi-line comments allow you to add comments that span across multiple lines. They begin with /* and end with */. Any text between these delimiters will be considered a comment.

css

/*
This is a multi-line comment
You can add multiple lines of comments here
*/

.selector {
  property: value;
}

It’s important to note that CSS comments cannot be nested. If you include a multi-line comment within another multi-line comment, it will cause syntax errors.

CSS comments are useful for various reasons, including :

1. Documentation: Comments help you explain the purpose of specific styles or sections of your CSS code, making it easier for others to understand and maintain the codebase.
2. Debugging: You can temporarily disable or comment out certain styles to troubleshoot issues or test alternative styles without deleting the original code.
3. Collaboration: When working in a team, comments can facilitate communication between developers, allowing them to provide feedback or suggestions on specific parts of the CSS code.

Remember that comments are ignored by the browser during rendering, so they have no impact on the appearance or functionality of the web page. They exist solely for human readability and understanding.