Microsoft HoloLens is an augmented reality headset that allows the user to see holograms overlaid on the real world. It uses see-through holographic lenses, spatial sound, and sensors to track movement to project holograms that appear life-like and integrated into the user's environment. Unlike virtual reality headsets, HoloLens does not fully immerse the user or prevent them from seeing the real world. It aims to transform how people teach, learn, create and work by empowering them with holograms through a cordless and untethered device.