The Oculus Rift DK1 is a virtual reality headset developed by Oculus VR, released in 2013 as a developer kit. It features a 7-inch display with a resolution of 1280x800 pixels, providing an immersive experience for developers to create VR content. The DK1 uses head tracking technology to allow users to look around in virtual environments. Designed primarily for developers, the DK1 was an early step in the evolution of virtual reality. It helped pave the way for future headsets by allowing creators to experiment with VR applications and games. The DK1 laid the groundwork for the commercial success of later models like the Oculus Rift CV1.