Generally speaking, we know that a ship or a plane without a pilot. The machine has become quite popular in the 21st century due to the silence of the pilot. In the meantime, we are always fascinated with the revolution of technology, whether it is artificial intelligence then there is no other way.
Drones are also very different in size.
The drone that has 4 wings, is called a quadcutter, 
immage source
and which has 6 fans, the hexapter, 
Immage Source
and the 8 wings that it holds are Octakcopter. 
Immage Source
On February 4, 2002, the first CIA drone was invented.
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