What is Drone?
[[File:Group photo of aerial demonstrators at the 2005 Naval Unmanned Aerial Vehicle Air Demo.jpg|thumb|300px|A group photo of aerial demonstrators at the 2005 Naval Unmanned Aerial Vehicle Air Demo]] An '''unmanned aerial vehicle''', often called a '''drone''', is an [[aircraft]] that is not operated by a [[pilot]] on board. Drones may have an onboard [[computer]] to take care of adjustments to [[wind]] and changes in [[air pressure]]. Sometimes they are programmed to a particular target. Important decisions are usually supervised by people on the ground communicating by radio. Large UAVs are mostly used by [[military]] forces, for example for [[reconnaissance]]. Some of them are programmed to be a target, to be shot at. A few carry weapons for unmanned combat. Drones also have [[civilian]] uses, such as [[Firefighter|firefighting]] or taking [[photograph]]s. Drones come in different sizes. [[Wingspan]]s range from a few centimetres to about {{convert|60|m|ft}}, the size of regular, manned aircraft. Photographers mount [[camera]]s on drones for aerial [[photography]]. [[Google]] has built and tested drones, for [[Delivery (commerce)|delivery]] of [[merchandise]].<ref>Stewart, Jack 2014. Google tests drone deliveries in Project Wing trials. ''BBC News'' Technology. [https://www.bbc.co.uk/news/technology-28964260]</ref> Some people use them in drone [[racing]]. Private drones are sometimes called a nuisance, even a danger.<ref>{{Cite news|url=https://www.washingtonpost.com/world/national-security/how-rogue-drones-are-rapidly-becoming-a-national-nuisance/2015/08/10/9c05d63c-3f61-11e5-8d45-d815146f81fa_story.html|title=Rogue drones a growing nuisance across the U.S.|last=Whitlock|first=Craig|date=2015-08-10|newspaper=Washington Post|access-date=2018-03-19|language=en-US|issn=0190-8286}}</ref> In many countries they are forbidden near cities and airports and other things. <ref>{{Cite news|url=https://www.flapone.com/blog/types-of-drones-available-in-the-market|title=Type of drones|last=Flapone|first=Drone|date=2