Airborne Laser Scanning (ALS) systems allow a direct and illumination-independent measurement from 3D objects in a fast, remote and accurate way. Beside basic range measurements, the current commercial ALS developments allow to record the waveform of the backscattered laser pulse. Latest trends in sensor developments focus on single-photon detection. Different applications are of interest, like urban planning, forestry surveying, or power line monitoring. Further to describe the 3D scene, products like digital terrain models (DTMs), digital surface models (DSMs), or city models are provided.