What is a Drone?
They don't fly about 'by themselves'. How would that be possible? Someone pilots them from afar. They can be used for many purposes, too many to mention here in a comment box. I'm giving you a link: @Mummyof3 Real drones are not a toy. Please check the link I've given.
Drones for noumerous applications like Aerial Photography, Monitoring, Search & Rescue etc.
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As someone mentioned, they do not fly by themselves, of course. They are remote-controlled. I'm sure they are expensive, but I would want to have one someday. I like the idea of aerial photography, or a way to explore from a different perspective. I have no interest in taking selfies. But I do want to be able to take pictures of landscapes, for instance, and bird's eye views.
@millie02 I think I first learned about drones a few years back when there were videos that came out taken with drones of what fireworks look like from within - I mean, you know, when there are fireworks in the sky, we normally look up at them from the ground. The drones took videos from up there.