Okay kiddo, let me explain to you what topos means. Imagine you have a bunch of different colored balls and you want to put them in a container. But instead of just putting them all in haphazardly, you decide to sort them into different categories first.
That's kind of like what a topos is--it's a way of sorting things into different groups based on certain rules or properties. But instead of balls and containers, we're talking about mathematical concepts and categories.
A topos is a specific kind of category in mathematics that has certain properties, like the ability to "pull back" information from one category to another, or the ability to define a concept of a "point" in a way that works even for structures that aren't necessarily point-like.
Basically, a topos is a way of organizing mathematical concepts into neat and tidy groups that have certain special properties. It's like putting all your blue balls in one container, all your red balls in another, and so on--you know exactly where to find each individual ball, and you can use that organization system to do all sorts of cool things with your collection!