If you're new to iPhone, iPod touch, or iPad and are wondering just what exactly AirPlay is, worry not -- you've come to the right place. AirPlay is Apple's term for their audio and video streaming technology. It's what lets your iOS 5 device, or iTunes on Mac or Windows, beam videos over Wi-Fi to your Apple TV so you can watch movies and play games on your big screen TV, or music to your AirPort Express router, so you can listen on your higher quality speakers.