Quantum entanglement is a remarkable phenomenon in quantum mechanics where two or more particles become interconnected in a way that the properties of one particle are instantly correlated with the properties of another, regardless of the distance separating them.
These particles are said to be "entangled," and their behavior is described by a shared quantum state. Changes in one particle's properties can instantaneously affect the other(s), even if they are light-years apart, a phenomenon referred to as "spooky action at a distance," as described by Albert Einstein.
Quantum entanglement challenges classical intuitions and has been a subject of intense research due to its implications for quantum computing, cryptography, and our understanding of the fundamental nature of reality.