What is module? Que es módulo?

Answer 1

7%2 = 7 modulo 2 = What is left when you divide 7/2 (integers can not be 3.2 or 3.7, must be 3 or 4...).
7/2=3, 1 is left. result of modulo=1.

Answer 2

If you are talking about this:

int x = 5;
int y = 3;

System.out.println(x%y);

Then I can explain this. You divide 5 by 3. You get 1 as an integer and 2 left. 2 is your answer.