What does a speaker do in a computer system?

In a computer system, a speaker primarily functions to produce audio output. It converts digital audio signals from the computer into sound waves that we can hear. When a user plays music, watches a video, or interacts with applications that generate sound, the speaker is responsible for reproducing that audio. This involves the speaker receiving the electrical signals representing sound from the computer and then vibrating in response to those signals to create audible sound waves.

The other options represent functions that are not typically associated with a speaker. For instance, processing and saving audio files pertains more to software and storage devices, while transmitting data wirelessly relates to devices like wireless adapters or routers. Displaying images on a screen is a function of monitors or display devices, which visualize graphic data rather than producing sound. Thus, the role of a speaker is uniquely aligned with the generation of audio output in a computing environment.