Modulo
Domain: Programming Fundamentals
🎯 Motivation
You often need the remainder after division - checking if a number is even, cycling through positions.
📋 Concrete Example
7 % 3 = 1 (7 divided by 3 is 2 remainder 1). 8 % 2 == 0 means 8 is even.
🔗 Analogy
Sharing 7 sweets among 3 friends - each gets 2, and 1 is left over. That leftover is the modulo.