An output device presents information to the user from a computer. Here are some examples of output devices:

Monitors and Projectors

Monitors and projectors are primary output devices for a computer. There are different types of monitors, as shown in Figure 1. The most important difference between these monitor types is the technology used to create an image:

All-in-One Printers

Printers are output devices that create hard copies of computer files. Some printers specialize in particular applications, such as printing color photographs. All-in-one printers, like the one shown in Figure 2, are designed to provide multiple services, such as printing, scanning, faxing, and copying.

Speakers and Headphones

Speakers and headphones are output devices for audio signals. Most computers have audio support either integrated into the motherboard or on an adapter card. Audio support includes ports that allow input and output of audio signals. The audio card has an amplifier to power headphones and external speakers, as shown in Figure 3.