In HTML, comments are used to provide notes or explanations within the code. They can be useful for debugging purposes or for adding context to complex code snippets.

<!-- This is a comment in HTML -->

Comments start with the opening tag <!-- and end with the closing tag <!-->. The benefit of comments is that they do not affect the functionality of the code, allowing developers to leave notes without disrupting the program's behavior.

Here are some best practices for using comments in HTML: * Keep your comments concise and focused on explaining a specific piece of code. * Avoid commenting out unnecessary code; this can confuse other developers reading your codebase.