In JavaScript, comments are used to add explanatory notes or annotations within the code. Comments are ignored by the JavaScript interpreter and do not affect the execution of the program. They are helpful for code documentation, providing context, and making the code more understandable to other developers. There are two types of comments in JavaScript:

1. Single-Line Comments:

- Single-line comments start with two forward slashes (//).
- Anything after // on the same line is considered a comment and is not executed.
- Example:

```javascript
// This is a single-line comment
let variable = 10; // Another comment on the same line

2. Multi-Line Comments:

- Multi-line comments are enclosed between /* and */.
- They can span multiple lines and are useful for longer explanations or disabling blocks of code.
- Example:

javascript
/* This is a multi-line comment
It can span multiple lines
and is often used for documentation */
let variable = 10;
/* You can also use multi-line comments
to disable blocks of code temporarily
or for testing purposes */
// let unusedVariable = 5; // This line is commented out

Comments are a valuable tool for organizing and documenting code. They can be used to provide explanations for complex logic, describe the purpose of functions or variables, indicate areas that need improvement or attention, and disable or debug code temporarily without deleting it. It's good practice to add meaningful comments that help others (including your future self) understand the code more easily.

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