Drones are basically small aircraft which do not have a human pilot on board, hence the abbreviated names, and so are controlled by a prior written program or software or even a remote control. Like, every other machine, they are also used to make our lives easier and better by doing things which are either too risky or too mundane to be done by a human. Since it is practically an aircraft, it has the ability to travel faster and also to reach places which are distant or difficult for a human to reach.