The term audio refers to sound or auditory information. It can be used in various contexts, such as describing a recording device that captures and records sounds (e.g., an audio recorder), a format for storing digital music files (e.g., MP3 audio files), or the quality of a speaker system's performance (e.g., high-quality audio). In general, "audio" refers to any form of sound that can be heard and perceived by humans through their ears.