An Unmanned aerial vehicle (UAV) also known as a drone is an aircraft being operated without a human aboard. Most of the drones are operated by either a remote control or a by a computer. Compared to manned aircrafts UAV's were originally used by the military for operations and missions that were too dangerous for humans.
The early unmanned aerial vehicle (UAV) was first seen in 1839 when Austrian soldiers attacked the city of Venice with unmanned balloons filled with explosives. Some of the balloons were successful, but most of them flew back and bombed their own lines so the practice did not become widely successful. .