音频 (yīn pín) literally means 'sound frequency' — 音 (yīn) means 'sound' or 'tone', and 频 (pín) means 'frequency'. Together, they refer to audio signals — the range of sound frequencies detectable by human ears (typically 20 Hz–20 kHz) or, more commonly in modern usage, digital audio content such as music, speech, or sound effects. It’s a technical term widely used in computing, broadcasting, and multimedia contexts.

The word is often contrasted with 视频 (shì pín, 'video'), emphasizing the audio-only component of media. While 音频 can appear in scientific discussions about acoustics, it’s most frequently encountered in everyday tech settings — for example, when adjusting audio settings on a device, downloading an audio file, or selecting an audio track in a video player. It functions exclusively as a noun and rarely appears in isolation without modifiers like '高清音频' (high-definition audio) or '音频文件' (audio file).