JavaScript comments are like any comment in another language. You can use two syntaxes. One is intended for blocks of code and the other for single-line comments.
It is started with double slash(//) and can be included either on a line by itself, or on a line following a statement. The interpreter considers as a comment everything that is between a double slash(//) and the end of the line.
// this is a single-line comment
It is indicated by a slash asterisk(/*) and an asterisk slash(*/). The interpreter considers as a comment everything that is between a (/*) and (*/) and allows to write comments on several lines.
/* this is a multiple line comment. if you need to be more descriptive or disable a large chunk of code */
