What is AirPlay? And why can't I find it?

I have seen the adds for AirPlay but can't find out anything about it. Help?

AirPlay consists of a couple of different parts: device discovery, and streaming media. In order for you to use AirPlay, you need an Apple device to share the media, and another device that supports AirPlay and will stream content from the Apple device. On the Apple device, the icons/buttons for AirPlay only appear if the device is connected to a network that contains another device capable of receiving the content.
The way it works is that the Apple device sends out a broadcast on the network it is connected to and essentially asks: "everyone that supports AirPlay, tell me your network address". Devices that recognize the request chime in with "I'm at address X and I can play music". The Apple device then keeps a list of AirPlay capable devices and when an app can send something over AirPlay, it sends a message "Hey device at X, here's some content" and X pulls the content from the Apple device and plays it.
There are a number of wireless speakers, stereos, and similar devices that do AirPlay audio. At the moment, though, I think only Apple products (like Apple TV) handle video.
The key, of course, is that you minimally need two devices for AirPlay: on that knows how to send the content, and one that knows how to receive it. If you don't have both, Apple software will not even show the icon/button for the feature (because you can't possibly use it).

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