abs() - Converts the number in the parenthesis to it's absolute value.
The absolute value of a number is it's distance from 0.
Absolue value is represented by ||.
|2| = 2
|-2| = 2
Examples:
abs(2)
2
abs(-2)
2
abs(3.14)
3.14
abs(-3.14)
3.14
*Note = Unlike negating a variable (-x), abs() ALWAYS returns a positive value.