Comments are lines of code that get ignored by the compiler, meaning they don't affect your project.
There are 2 types of comments, one being single-line comments, which you can declare by using the // prefix.
The other one is multi-line comments which start with /* and end with */. Any text between will be considered as a comment.
Comments can be used to leave notes for yourself or other programmers that may be working on the same project.
Comments can be used to "ignore" lines of code, skipping their execution.