The drones or unmmanned aerial vehicles were first covered in the mainstream media when they were used by the United States military. The drones were used for photography, making videos of enemy country.
The US military used the drones for eliminating terror suspects in Yemen, using the drones for locating them and firing missiles.
It is far safer to send a drone into enemy territory, rather than sending a plane which will cost millions of dollars, and there is always a risk that the plane will be shot down or may malfunction
They were also allegedly used extensively in Afghanistan, Iraq and other countries where the United States army is involved in low intensity conflict