Speakers
Most computers allow you to hook up external speakers. The speakers receive the audio from the computer and produce sound waves. Most speakers can amplify the sound from the computer and they usually come in twos which allows them to produce sound from both speakers.
Headphones
Have a strap that rests on the top of the head, positioning a pair of speakers over both ears. They are used mainly for listening to music and audio tracks both left and right speaker is required. When you want to use it for talking you need a microphone and only one speaker is required.
Monitor
The monitor displays the computers user interface and open programs and allowing the user to interact with the computer, typically using the keyboard and mouse.
Printer
A printer is an output device that allows you to print paper documents. The different types of documents include text documents, images or a combination of both. The two most common types of printers are inkjet and laser printers. The printed document is often called a hard copy.
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