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An input device is something that inputs information. Eg: keyboard and mouse.
An output device is something that outputs information. Eg: television or computer.
Some input and output devices
 iPads iPods and iPhones
 Joysticks and barcode scanners
 Headphones and speakers
 CDs and DVDs 
 Printers
 Scanner and an optical pen
 Televisions and computers

How to what is an input or output device

What Is an Input or Output Device