Computers perform an assortment of tasks; however, like a human that doesn't have eyes, ears, a voice or hands. Without input and output devices, computers would be virtually useless – void of communicating with the outside world. Good devices stick around, which is why there are only a handful of input and output devices most people are familiar with.
King of the input devices – the keyboard is no stranger to most people. In fact, its history dates back over a hundred years when the "QWERTY" keyboard was invented for typewriters. Designed so that frequently-used keys wouldn't hit each other and stick, this keyboard type became so prevalent that newer models never had a shot at competing. Today's computer keyboards control text input into computers, allowing document processing, as well as navigation.
For output devices, monitors hold the reign as our leading visual stimulator. Monitors visually display everything a user is doing on the computer. The layout of the screen on the monitor takes the programming design of the "operating system," which is the software that the computer's hardware is utilizing to communicate with the computer user. Monitors display software programs, as well as anything from the Internet.
Mouse and Audio/Video Devices
The mouse makes the computer navigation experience easier, operating on a "point and click" basis. Video cameras designed for computers serve as another input devices. They send digital images to the computer. Microphones allow sound to be transmitted to computers. Speakers allow people to hear sound from other users or audio files.
Printers and Scanners
Printers have been around for a long time. They turn digital documents into a physical documents. Conversely, scanners take a physical object and turn it into a digital document, which can be transmitted via the Internet.