What type of device outputs audio from a computer?

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The device that outputs audio from a computer is the speaker. Speakers are specifically designed to convert digital audio signals from the computer into sound waves that can be heard by the user. They play an essential role in delivering audio output for various applications such as music playback, video soundtracks, and gaming audio, thereby enhancing the overall user experience.

In contrast, a microphone is used for audio input, capturing sound and converting it into electrical signals for processing by the computer. A keyboard is an input device that allows users to input text and commands into the computer but does not produce sound. A scanner is a device that captures images or documents and converts them into digital format for the computer but is not involved in audio production. Therefore, when considering the function of outputting audio specifically, the speaker is the clear and correct choice.