Stack (mathematics)

Okay, so imagine you have a bunch of blocks, and you want to put them on top of each other. That's kind of like a stack in math.

But instead of blocks, we have numbers or other things we want to organize. We want to put them in a specific order, like from smallest to biggest or from earliest to latest.

We can do this by taking the first thing and putting it on the bottom of the stack, then taking the next thing and putting it on top of that one, and so on.

Then when we want to use the things in the stack, we take the top one off first. It's like taking the top block off the stack before you can get to the ones underneath.

So a stack is just a way to order things by putting them on top of each other and taking them off in a specific order.