Please identify which are "callback" in the code below

Tell us what’s happening:
The lessons keep referring to callback functions but it
is not clear what is a “callback”.
Please explain line by line in the code below what is
a callback function.

Your code so far

function destroyer(arr) {
var args = Array.from(arguments).slice(1);
return arr.filter(function(val) {
  return !args.includes(val);

destroyer([1, 2, 3, 1, 2, 3], 2, 3);

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Challenge: Seek and Destroy

Link to the challenge:

This part is the callback function.