Why should we even seek an answer to this question? Everybody knows. We use them every day; they’re all around us, and we cannot even imagine life without them. Well, you would not believe how many people cannot give you a definition, even if they use computers all day long. Find out yourself and ask some people what a computer is. You may be surprised how weird answers will you get. Search Wikipedia or google for it to see if you can find a workable definition that makes sense. I couldn’t, so I have invented one:     I’m not saying that this is the only right definition of computer, however, it always worked me when teaching people it even works very well for developers to understand MVC (Model-View-Controller) architecture better.