This lecture overviews LiDAR principles and technology. Active 3D shape reconstruction methods. Time-of-Flight principle. Pulsed wave. Continuous-wave propagation. Laser ToF Technology: LiDAR. LiDAR in Autonomous Systems: cars, drones.  Drone LiDARs (Technical Specifications of Current Model, Alternatives for potential upgrade). Radio wave Technology: Radar. Sonar.