Daydream introduced in Android4.2 this feature lets your Android device display useful and delightful information when idle or docked. Shows off your photo albums get the latest news from Google Currents, and more.
Daydream is a new interactive screensaver mode for Android devices. It activates automatically when the device is inserted into a dock or when the device is left idle while plugged in to a charger (instead of turning the screen off). Daydream displays one dream at a time, which may be a purely visual, passive display that dismisses upon touch, or may be interactive and responsive to the full suite of input events.