Empty sum

Imagine you have 0 candies. You have no candies at all. No matter how much you count, there are no candies. This is like an empty sum. A sum is like when you add up a bunch of numbers, but if there are no numbers at all, then it's an empty sum. It's like trying to add 0 candies to 0 candies. The answer is still 0, because there are no candies to add together. So an empty sum is just like having no candies or no numbers to add up.