AirPlay is Apple’s own system for wirelessly streaming both audio and video from Apple devices to speakers and displays. It was originally known as AirTunes.
It can be used to stream from one Apple device to another (for example, a Mac to an Apple TV, or an iPhone to a HomePod), or from an Apple device to a third-party device like a speaker or TV.
The original version allowed iTunes on the Mac to stream to multiple devices, while iPhone and iPad could stream to only one at a time.
AirPlay 2, launched in 2018, extended multi-room support to iOS devices too, as well as supporting audio streaming to stereo speaker pairs and improved buffering.
Many third-party speaker brands have delivered or promised support for AirPlay 2, including Bang & Olufsen, Bluesound, Bowers & Wilkins, Denon, Devialet, KEF, Libratone, Naim and Sonos. Compatible TVs include models from LG, Samsung, Sony and Vizio. A full list of compatible devices can be found on Apple’s website.