The controller-free interface for the Xbox 360. Announced as Project Natal in 2009 and introduced in November 2010, the Kinect option opens a new world of interaction with the Xbox. It uses a sensor device with motion, face and speech recognition that is placed under the monitor and connected to the Xbox. Players interact by speaking and using hand and body motions. Like Nintendo's popular Wii, people use their body to interact with the game. Video Kinect (Video Calling) Video Kinect lets people start up a video call to Windows Live and other Xbox users while sitting in their living rooms. Photo sharing and collaborative applications enhance the video calling session. See Xbox. Kinect for Windows After its debut for the Xbox, hackers began to experiment with Kinect for non-gaming purposes. Recognizing the interest and enthusiasm for using Kinect to interact with a computer in new ways, Microsoft introduced the Kinect software development kit for Windows in 2011. It lets developers create apps with Kinect's skeletal tracking and speech recognition features. See Windows Holographic.