When a set of particles are created, communicated, or shared by spatial proximity in a manner that stops the quantum states of any one of them from being independently described, regardless of how far apart they are from one another, this physical phenomenon known as quantum entanglement takes place.
The fundamental difference between conventional and quantum physics is the issue concerning quantum entanglement, which is the essence of quantum mechanics that is absent from classical mechanics.
It is possible to find instances where measurements of entangled particles’ physical characteristics, such as orientation, momentum, rotation, and polarization, are fully synchronized.