Quantum entanglement is a mysterious connection between two or more particles. When particles become entangled, their states are linked—no matter how far apart they are.

If you measure one particle, you’ll instantly know something about the other, even if it’s on the other side of the universe! This connection doesn’t depend on space or time—it’s instant, and it puzzled even Albert Einstein, who called it “spooky action at a distance.”

Entanglement plays a key role in future technologies like quantum teleportation and quantum communication