Audio is an electrical or other representation of sound.

Audio may also refer to: Audio, audible content in media production and publishing. AUDIO (group), an American R&B band of 5 brothers formerly known as TNT Boyz and as B5. Audio (album), an album by the Blue Man Group. Audio (magazine), a magazine published from 1947 to 2000.

Car audio/video (car AV), auto radio, mobile audio, 12-volt and other terms are used to describe the sound or video system fitted in an automobile. While 12-volt audio and video systems are also used, marketed, or manufactured for marine, aviation, and buses, this article focuses on cars as the most common application. From the earliest days of radio, enthusiasts had adapted domestic equipment to use in their cars. In the 1960s, tape players using reel-to-reel equipment, Compact Cassettes, and then 8-track cartridges were introduced for in-car use.