# How to comment in javascript?

### What are comments ?

Comments are lines of codes javascript intentionally ignore. They don't do anything. We can use comments in our code to make notes on what the code does so that it will be easier to read later time for us.

There are 2 types of comment in javascript 
- In-line comment
- Multi-line comment

### In-line comment 

You can do in-line comment by typing `//` or by pressing `Ctrl + /` on windows and `Command + /` on mac.  You can use in-line comment to comment a line in Javascript or to add note in the end of a line. 

```
var num = 1; \\ 'in-line comment at the end of a code'

//var num = 1; this code will note run
```

### Multi-line comment 

To do a multi-line comment add `/*` in the starting of the comment and end it with `*/`. 

```
/*
This is a 
multi-line comment
*/
```