1. To comment out one line, place // in front of a line of code. For example:
// This is a single-line comment.

1. To comment out multiple lines at once, indicate the start of the comment with /* and the end of the comment with */. For example:
/* This is a multi-line comment.

To remove a comment (or uncomment a line), simply delete the // for a single-line comment, or the /* and the */ characters for the multi-line comment.