Computer peripherals are external devices that enhance your machine's functionality through better performance, design, sound quality and more. Add-ons range from essential input devices like keyboards, to enjoyable output devices like speakers. Whether you use your machine for work, gaming, or entertainment, peripherals can improve your system's productivity and usability. How often you use your computer, the type of work or play in which you engage, and your physical needs will determine which devices are best for you.