Higher Order Arrow Functions percent sign

JavaScript
1

I am on the “Higher Order Arrow Functions” section for Javascript and the solution included punctuation and functions that have not been discussed yet.
What does “%” do in Javascript?
Example:
const squaredIntegers = arr.filter( (num) => num > 0 && num % parseInt(num) === 0).map((num) => Math.pow(num, 2));

I figured out what “Math.pow()” does from google. This function was not yet discussed in the lessons either.

Thanks for the help!
Marshall