"...What can all this possibly mean? Niels Bohr managed to answer this question in a way one can work with, and many physicists, to this day, find his answer satisfactory. It is called the 'Copenhagen interpretation' of quantum mechanics. Instead of saying that the electron sits at point x, or a point y, we talk about the state of an electron. Then we not only have the state 'x', or a state 'y', but also states such as 'partly x and partly y'. "

Quantum theory Interpretations