Which is one of the reasons Einstein called it "Spooky". The "communications" happen "instantaneously", IOW, faster than the speed of light.
Understanding this on a deeper level might have all sorts of "interesting" consequences and applications.
I’ve always thought the two entangled, separated particles are adjacent in some higher dimension, or even occupy the same space in the higher dim, making speed of light constraints moot. But I don’t have the quantitative IQ to even start on a mathematical exploration of the concept.
Is it really 'communication'?
Or is it the result of matched sets which must maintain a balance?
Like a teeter-totter. If one pushes down on the seat, the other seat, around eight feet away, instantaneously goes up.
The mystery, to us, is the pipe in the middle.
It should be regarded as a quantum-style conservation law, in this case conservation of spin angular momentum. (teeter-totter)