Okay kiddo, a subobject classifier is a special thing we use in math to help us talk about parts of things.
Let's say you have a cake. You can cut the cake into pieces, and each piece is a part or a subobject of the cake.
Now, imagine you want to talk about all the possible ways you can cut the cake into different subobjects. The subobject classifier helps us with this. It's like a special tool that lets us group together all the different ways we can cut the cake.
We can use the subobject classifier to help us talk about all the different ways we can cut up any object, not just cakes! And it's really helpful when we're doing math because we can use it to prove things or solve problems.
So, next time you have a cake, think about all the different subobjects you could make and how the subobject classifier helps us talk about them!