This is a page about entanglement theory, but don't worry, it's not as complicated as it sounds.
Entanglement is like when you're at the grocery store, and you're thinking about buying some milk, but then you start wondering if you really need milk, and suddenly your cat appears on the shelf, staring at you with an unblinking gaze, and you're all like " Wait, what's going on here?"
But seriously, entanglement is when two or more particles become connected in such a way that what happens to one particle instantly affects the other, even if they're on opposite sides of the universe. Like, imagine you're in a relationship, and you're feeling all connected to your partner, but then you find out they've been reading your email, and now you're all like "Uh, no, we're not that connected."
And don't even get me started on superposition. That's when you're trying to choose between two ice cream flavors, but then you realize that you can have both, and now you're questioning the fundamental nature of reality.
I'm not saying it's not cool, but I'm also not saying it's cool. It's just entanglement, man.
Entanglement is not just a thing, it's a thing-entanglement.