ELI5: Explain Like I'm 5

Modulo-N code

Okay kiddo, today I will explain what a modulo-n code is. First, let’s start with what “modulo” means. Modulo is a fancy math word that helps us when we have to divide numbers. When we divide two numbers, we usually get a quotient (the answer) and a remainder (the left over bit). For example, if we divide 13 by 5, the quotient would is 2 with a remainder of 3 (because 5 goes into 13 twice with 3 left over).

Now, let’s talk about modulo-n code. It's a special way to represent numbers in a sequence with only n possible values. Imagine you are playing a game of “Red Light, Green Light” and you can only take steps of a certain size. Let’s say you have to take steps that are no longer than 5 inches. Every time you take a step, you can count your steps up to 5 before you have to stop and start counting again from zero.

For example, if you count 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, 0...and so on, you are counting using modulo 5 code. This means that you have 5 possible values (0, 1, 2, 3, 4) and you are only counting to the maximum of 5 before starting again from the beginning.

In coding, we use modulo-n code to make things easier. It's like using a specific pattern or sequence to represent the numbers that we want to use. It can help us with things like encryption, data transfer, and more. By using modulo-n code, we are able to simplify how we represent data and make it easier for computers to process and understand.