Problem of other minds

The problem of other minds is a problem that has to do with whether we can ever truly know what's going on in someone else's head. We can see how they behave, and we can guess what they may be thinking or feeling, but we can't actually get inside someone else's head and know exactly what they're thinking, feeling, and believing. We can't ever be sure that someone else's thoughts and feelings are the same as ours. That's the problem of other minds.