Quantum nonlocality is a phenomenon in quantum mechanics that describes the ability of quantum systems to exhibit correlations that cannot be explained by classical physics, even when parts of the system are separated by large distances. This concept is closely associated with entanglement, where two or more particles become interconnected in such a way that the state of one particle instantaneously influences the state of another, regardless of the space between them.
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Quantum correlations incompatible with Bell local causality under additional assumptions including measurement independence. This is an operational statement about joint probabilities, not controllable faster-than-light signaling: quantum predictions also obey quantum no-signalling. Entanglement alone does not guarantee violation of a specified Bell inequality in a given measurement arrangement.