Drones are vehicles that travel without a human pilot or driver on board. Drones can fly in the sky or dive deep beneath the ocean. Some are large enough to carry passengers, and some are small enough to fold up and put in your pocket. Drones are used for a wide range of different tasks, from taking photos and videos, to planting trees, to helping rescue swimmers who are in trouble. But there are also ways that drones can be harmful, and some people believe that drones should be banned.