Drone engineers develop drones based on their knowledge of different branches of engineering, such as aeronautical, electronics and electrical, mechanical, and robotics engineering. Also known as unmanned aerial vehicles (UAVs), drones may be used for commercial, consumer, or combat purposes. For example, they may be used to survey damage after natural disasters like hurricanes and floods, gather military intelligence, survey land for real estate and construction purposes, and collect information on crops and endangered species. Many mechanical engineers are involved in the design and manufacturing of drones.