In this video, we learning how to write comments in our code. We'll be writing the single line comments and the multi-line comments. Sometimes we write code in our program and then not use it immediately. Commenting it out is a way of using that code later in the program or maybe there are other developers who are going to need to check your program, a comment will help others to understand what is happening on that program. Single line comment ( // double forward slash - /* multi-line comment */ ). Thank you.