What does "math.abs" do?

Answer 1

If you're still unsure:

In mathematics, the absolute value of a number is defined as:

|x| =
if x < 0: (-1)*x
if x >= 0: x

So, if the number is negative multiply it by -1. Otherwise, leave it as is.

Answer 2

And going deeper, absolute value of a number is a distance from zero to that number. So it's always positive.

Answer 3

Returns absolute value of a number. abs(5)=5; abs(-5)=5