Are they purely for fun? Actually not! Input devices are essential for a computer to work correctly. Input devices allow the user to communicate with the computer to tell it what they want to do. Anytime data is sent to the computer by a device, the device is considered an input device. If you like them or not, you just have to learn to deal with them. Here is a short outline of this section:

Continue with the first section of Input Devices, Keyboards.