Quantum entanglement is a phenomenon that occurs when two or more particles become connected in such a way that the properties of one particle are dependent on the properties of the other particle, regardless of the distance between them. This feature is at the heart of the disparity between classical and quantum physics because it violates the classical notion of local realism, which states that physical properties of objects exist independently of measurement and that physical influences cannot travel faster than the speed of light.

In classical mechanics, particles are considered to be independent of one another, and their properties can be measured and predicted with relative ease. However, in quantum mechanics, particles can become entangled, and their properties become correlated in ways that cannot be predicted using classical mechanics.

Entanglement is a primary feature of quantum mechanics because it is fundamental to the nature of quantum particles themselves. In fact, it is impossible to fully understand the behavior of quantum particles without considering the effects of entanglement. Moreover, entanglement has been shown to play a crucial role in many quantum technologies, including quantum computing and quantum cryptography.

Overall, the phenomenon of quantum entanglement is a key feature of quantum mechanics that distinguishes it from classical mechanics, and its study has led to many important insights and technological advancements in the field of quantum physics.
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