Imagine space and time as a giant, twisty tornado, and you're stuck in the eye.
Entanglement: when two or more particles are connected in a way that's like they're stuck in a perpetual game of cosmic telephone. Say something in one corner of the twister, and it instantly affects the other corner, even if they're on opposite sides of the universe.
Because if you can use entanglement to send secret messages to your friends on the other side of the universe, you can finally get away with sending them weird, unsolicited memes.