I don't get the meaning of Modulo. Can anybody please explain it

Answer 1

In simple words, a%b gives the remainder when a is divided by b

Most students are taught that "Dividend = Divisor * Quotient + Remainder"
In more sophisticated language, this is the Division Algorithm : For any integers a and b such that b is non-zero, there exist unique integers q and r such that a = b*q + r where 0<=r<b

So a%b gives r

For example, 9 = 2*4 + 1
So 9%2 = 1

Another way to think about it is something like this.
Imagine you have 26 apples and you want to pack them in groups of 7.
26%7 will give you the number of apples left after all the groupings are done.
In this case, you will get 3 groups of 7 apples accounting for 21 apples with 5 apples left. These 5 apples cannot be packed into groups of 7 as 5<7
So 26 = 7*3 + 5
This means 26%7 = 5

Note that making 0 groups is allowed, but the number of remaining apples should be less than that in each group.

Answer 2

It's known as the remainder operator nowadays. It's extremely similar to division but it returns the remainder.

15 % 7 = 1

7 goes into 15 twice which is 14 with a remainder of 1.

Also, if you have any questions be sure to search and see if anyone else asked or if you're adventurous do a Google search.