An absorbing set is kind of like putting on a raincoat when it's raining outside. Imagine you are outside in the rain and you get all wet. But, if you put on a raincoat, the rain can't soak into your clothes and make you wet anymore.
Now, let's think of this in terms of math. Whenever we have a set (like a group of numbers or shapes), an absorbing set is a special kind of set that can "absorb" or "swallow" any other set into itself.
For example, let's say we have a set of numbers from 1 to 5. If we have another set that includes one of these numbers (like the set {3}), we can "absorb" that set into the original set. This means that we can add the numbers from the second set into the original set and they all become part of the original set. So, the set {1, 2, 3, 4, 5} is an absorbing set in this case.
Absorbing sets are very useful in math because they can help us prove things. We can use the fact that a set is an absorbing set to show that certain mathematical operations will always work. It's like having a safety net to catch any stray numbers or shapes that might come along!