Difference set

Alright, imagine you have a box of colorful candies. Let's say you have red candies, blue candies, and green candies. Now, you decide to take out some candies from the box and put them in a special cup.

The set of candies in the cup is like a special group of candies that you have chosen. This set is called a "difference set". It's special because it only contains certain candies that are different from each other.

For example, if you choose to put only red candies in the cup, the difference set will only have red candies. If you choose to put both red and blue candies in the cup, the difference set will have a mixture of red and blue candies.

The word "difference" in the term "difference set" means that you are looking for candies that are different or distinct from each other. You are not including the same type of candy twice in the set.

So, in short, a difference set is like a special collection of candies where each candy is unique and different from the others in the set.