Drones are more formally known as Unmanned Aerial Vehicles (UAVs) or Unmanned Aircraft Systems (UASes). Essentially, a drone is a flying robot that can be remotely controlled or fly autonomously through software-controlled flight plans in their embedded systems, working in conjunction with onboard sensors and GPS. Drones can be classified on a different basis – for example based on "USAGE" like Drones for Photography, Drones for aerial Mapping, Drones for Surveillance etc.