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5. Monitor
The most common output device, monitors enable users to interact with a computer more easily. The monitor essentially displays a signal sent by the computer in a visual format.
Monitors look similar to televisions in outward appearance but typically have a higher display resolution than televisions, enabling greater visual detail, plus they lack a tuner to change channels. As with televisions, modern computer monitors use flat screen technology and have fallen in price in recent years.
6. Speakers
A computer speaker is another common type of output device. They typically come in pairs to provide stereo sound and sometimes with a subwoofer unit, too, in order to enhance bass frequency. Computer speakers usually have built-in amplifiers and therefore require a power supply, either from the mains, batteries or via a USB port.
In the past, speakers normally received their audio signal via a 3.5 mm jack plug, but it's increasingly common nowadays for computer speakers to be wireless and use Bluetooth technology. Altec Lansing claims to have produced the first commercially available computer speakers in 1990.
7. Projector
Projectors are optical output devices that enable a roomful of people to see visuals generated by a single computer. As their name suggests, projectors "project" still or moving images onto a screen, blank wall, or other surface.
Digital projectors first came onto the market in the early 2000s and have now almost completely replaced older, pre-digital models. They are typically used for presentations, watching movies, or as a teaching aid and usually connect to the computer via the HDMI port.
8. Printer
Printers are another common form of output device. They are used to generate hard copies of electronic data stored on a computer, most often text or images, onto paper. The first electronic printer to be invented was the EP-101, released by the Japanese company Epson in 1968.
Inkjet and laser printers are two of the most common types of printers found today, with modern printers connecting to the computer via the USB port or WI-FI. The rise of other technologies, such as email and data storage devices, has somewhat diminished the importance of printers in recent years.