Why Comments are important?

Comments are important because:

• Anyone can understand which variables you declared and what are uses of those variables in your program.
• Documentation.
• Even when you see your own program after 2 to 3 months you can't recollect for which reasons you used which variables. So, you can refer your comments.

In C language, comments are given by either //...// or /*...*/

If you want single line comment, you must use //...//

For multi-line comment use /*...*/

Summary:
It is good practice to declare comments as it helps developer.
Comments are ignored by compiler.

If you want single line comment, you must use //...//

For multi-line comment use /*...*/