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Entanglement, a phenomenon in quantum mechanics, describes a special connection between two or more quantum particles. When particles are entangled, they become linked in such a way that their fates are intertwined, regardless of the distance separating them. This means that measuring a property of one entangled particle instantaneously influences the corresponding property of the other(s), even if they are light-years apart.

This correlation is not due to any classical communication between the particles. Instead, it arises from their shared quantum state from the moment of entanglement. For instance, if two electrons are entangled in terms of their spin, and one is measured to have spin-up, the other will instantaneously be found to have spin-down, and vice-versa. The outcome of the first measurement is probabilistic, but once it occurs, the state of the second particle is determined with certainty.

Albert Einstein famously referred to this seemingly instantaneous influence as "spooky action at a distance," as it appeared to violate the principle that information cannot travel faster than the speed of light. However, numerous experiments have confirmed the reality of entanglement. While it doesn't allow for faster-than-light communication (as the outcome of any single measurement is still random), entanglement is a fundamental aspect of quantum mechanics and has significant implications for quantum computing, quantum cryptography, and our understanding of reality itself.