Entanglement works like synchronized clocks. You can't send information, but you can coordinate actions to a similar effect. Much like you can coordinate actions of separate groups using synchronized clocks with no communication except for passing time.
That's the "hidden local variables" theory. Experiments seem to suggest it's wrong. How one pair is observed appears to affect (change) the other instantaneously. But, not in a way we can use to our advantage to get instant communication.
Exact mechanism is different from synchronized clocks, it's an illustration how you can have correlation without communication and how you can use it in practice, an this correlation works with both entanglement and synchronized clocks.
It seems some aspects can be explained by (modelled as) synchronization, but not all. "Spooky action at a distance" resembling faster-than-light communication still exists.
The two top explanations are either some info can travel faster than light (from our perspective), or the universe forks into copies when needed.
