When one number is divided by another, the modulo operation finds the remainder.

Modulo  is denoted by the % symbol.
Example
Assume that you have two numbers 11 and 3. 11%3 is 2 because when 11 is divided by 3, the remainder is 2.
>>> 11%3
2

>>> 11%3
2
>>>

>>> 11%3
2
>>>

>>> 11%3
2

>>> 11%3
2