I have read quite a bit on here and elsewhere, but am still coming to terms with pure, mixed, entangled and product states. I know a state is either mixed or pure, but then is engtaglement a sub-class of being mixed? Or a sub-class of being pure? Or is entangled another name for pure? Or something different altogether? Also is a product state another way to say mixed? Is it the opposite to entanged? As you can see, I am very confused! Thanks in advance of replies posted. Kop442000.