Microsoft HoloLens is an augmented reality headset that allows users to interact with holograms overlaid in the real world. It uses advanced sensors and an optical projection system to generate multi-dimensional holograms with low latency. A custom processing unit analyzes sensor data in real time to understand gestures and the environment. HoloLens has transparent lenses, adjustable fit, and integrated speakers for an immersive experience without cords or phones. While it enables new forms of collaboration and productivity, HoloLens has limitations including very high cost, limited availability, lack of service centers, and high bandwidth usage.