Quantum entanglement is a phenomenon in which two or more particles become connected in such a way that the state of one particle is dependent on the state of the other, regardless of the distance between them. When two particles are entangled, measurements made on one of the particles will instantaneously affect the state of the other, no matter how far apart they are. This means that the entangled particles are inextricably linked and behave as if they are one system, even if they are light-years apart.

The concept of entanglement was first proposed by Albert Einstein, Boris Podolsky, and Nathan Rosen in 1935 as a way to show the incompleteness of quantum mechanics. However, it wasn't until the 1960s that physicist John Bell developed a mathematical framework to test for the existence of entanglement, and experiments in the 1980s finally confirmed that entanglement was a real phenomenon.
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