So what is a mainframe? The answer to that question might, at first glance, seem to be obvious to some of us who have worked with mainframe systems our entire career. But have you ever really tried to step back and think about the question? What if your Mother asked you what you do? Could you talk to her about mainframes in terms she would understand? After the discussion, would she know, at any level, how a mainframe is different than other types of computers when you were done? And would she have any idea what it is that you do all day?