Drones, also known as unmanned aerial vehicles (UAVs), are controlled aircraft without a human pilot onboard. They can be used for aerial photography, surveillance, transport, search and rescue, and in some cases, armed attacks. Drones provide advantages over manned aircraft by not requiring a pilot, being able to enter any environment, reducing operator risk, and having extended flight times. However, they also have limitations in abilities and increased hardware complexity. The FAA regulates drone use for hobby, recreation, and commercial purposes, requiring notice to airports and restrictions on visual line of sight, altitude, and airspeed depending on the intended use.