What is difference between negative reinforcement and punishment in psychology?

Punishment is a moral concept; someone has done something wrong and therefore deserves to suffer a punishment. Negative reinforcement is not a moral concept but a pragmatic concept; we do not want someone to do something, therefore we give them a reason not to do it, in the form of some undesired consequence. Of course, the actual process of either punishment or negative reinforcement could turn out to be exactly the same. Only the motive is different.