An input device sends information to a computer system for processing, and an output device reproduces or displays the results of that processing. Input devices only allow for input of data to a computer and output devices only receive the output of data from another device
monitor - output device
earphone - output devices.
speakers - an output hardware device
An audio interface is really any device that allows a computer to connect to audio devices. These audio devices can be either input or output devices and include inherently analog devices such as headphones, monitors, microphones and instruments.
output devices
Speakers receive information from computers (think smartphones, laptops, tablets, etc.) and are, therefore, output devices. This information is in the form of digital audio. As we've discussed, the digital audio must pass through a DAC before it is able to drive the speakers to produce sound.
To learn more about Input devices and Output devices, refer
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