Quantum entanglement
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Quantum entanglement is a term used to describe how two particles interact.
Once two particles interact, they become a system. It is as if a long string is attached between them that can never break. They exist as one although they are two. It's as if they now sit on the same teeter-totter seesaw. No matter how long the seesaw is, even if it is one million miles long, you push one end down and the other end goes up instantly. This is not due to one particle sending a message to the other particle saying, "I'm going down, therefore, you must go up" and waiting for the particle to receive the message, but the particles are always connected and do not have to send signals to each other, they always react to each other at the same time because they are part of the same system called "the same quantum state".