Very simply, the Raspberry is just a computer. Like any other computer you will normally plug in a keyboard, mouse and monitor, although you don't need to (as we are doing here, it works just as well without). There are a few major differences between the Pi and a normal computer, however:
- It is very low cost (around £30)
- It can control hardware directly through its GPIO (General Purpose Input / Output) pins. We use these to control the motors in the arm
- It has a large educational focus so there is lots of support for learning to program on it.
- It has a massive community of users who are generally pretty helpful and encouraging to new users