Okay kiddo, imagine you have a bunch of cats in your room. They like to play and run around, right? But sometimes they bump into each other and it gets kind of crowded.
Now imagine that instead of just having one room, you have a bunch of different rooms connected by doors. Each room is like a different possibility or state that the cats can be in. Some rooms might have toys, some might have food, and some might be empty.
A cat(k) space is like a way of describing all the different possible combinations of states that the cats can be in, depending on how many of them there are (that's why we use the "k" instead of a specific number). We draw lines between the rooms to show which ones are connected to which others.
This might sound a bit confusing, but it's actually really useful for figuring out how the cats will behave over time. Just like if you watch the cats playing in your room, you can start to predict which ones will go where and what they'll do next based on how they've acted before.
Scientists and mathematicians use cat(k) spaces to help them understand all sorts of things, from the behavior of electrons to the way diseases spread through a population. Pretty cool, huh?