I have a question with regards to quantum entanglement, and how it relates to the concepts of realism and locality. I am just an interested amateur who has self-studied QM in my free time, so perhaps I should first run my understanding by you first, to make sure it is accurate : the basic idea is that quantum entanglement creates a statistical correlation between the measurement outcomes taken from the individual components of the entangled system. While an isolated measurement taken from an isolated component of such systems will have an essentially random outcome, the comparison between separate measurements taken from separate components will show a correlation that is stronger than would be expected classically. More technically, an entangled state is one that cannot be separated into pure states, so its state vector cannot be written as a simple tensor product of simpler vectors. This is merely a statistical correlation, not any kind of causation, action or FTL transmission. In other words, we are dealing with a system the individual components of which are described by a single wave function, irrespective of their spatial separations. I hope this overall understanding is largely correct. Now my question : how does this relate to the concepts of realism and locality ? I was always under the impression that, because entanglement does not depend in any way on the spatial separation between particles, this phenomenon is an example of quantum non-locality. However, the other day I came across this : http://physics.stackexchange.com/qu...nglement-and-spooky-action-at-a-distance?lq=1 specifically the first answer by ACuriousMind. This seems to imply ( or maybe I am just not understanding it correctly ) that entanglement is best understood not as a manifestation of non-locality, but rather of abandoning realism. So what is the answer ? What are the real meanings of realism and locality in the context of quantum mechanics, and how does this relate to entanglement in particular ? I just wish to understand this a little bit better. Thank you in advance !