APOD is a lean piece of software that automatically brings to your desktop a new daily inspiring editor-picked astronomy picture with an explanation written by professional astronomers. Astronomy Picture of the Day is a web site hosted by NASA and maintained by professional astronomers who pick a new exciting beautiful astronomy picture every day. Astronomy Picture of the Day has been active for more than 7 years, successfully sharing the beauty of the universe with us all. APOD brings it one step further, setting those beautiful astronomy pictures, optionally with their scientific explanation, as your desktop wallpaper.