javascrips operators

Question

What is % really do?
I am not understand it.

Answer 1

Is mod,
In JSP is other use.

Answer 2

As Sachin Artani said you can check a division's remainder. It's often used for checking for divisibility, if the remainder is zero you know a number is divisible by another.

Answer 3

It's a modulo operator which is used to find out the remainder. eg.
7%2 is 1