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Drones are basically tiny airplanes that are unmanned and controlled remotely. According to techtarget.com, the defintion of a drone is an unmanned aircraft. Drones are more formally known as unmanned aerial vehicles (UAVs) or unmanned aircraft systems.
Drone Types/Uses
There are two main types of drone platforms: rotor, including single-rotor and multi-rotor, such as tricopters, quadcopters, hexacopters and octocoptors; and fixed-wing, which include the hybrid vertical takeoff and landing (VTOL) drones that don't require runways.Nonmilitary drones are generally either personal and hobbyist ones or commercial aircraft. UAVs were most often associated with the military. They were initially used for anti-aircraft target practice, intelligence gathering and, more controversially, as weapons platforms. Drones are now also used in a range of civilian roles such as search and rescue, surveillance, traffic monitoring, weather monitoring, firefighting, personal use, drone-based photography, videography, agriculture, and delivery services. 
Even the FBI uses dones for surveillance and countersurveillance in order to evade or impede law enforcement. However, they have also observed the use of UAS to harass and disrupt law enforcement operations. The FBI is concerned that criminals and terrorists will exploit UAS in ways that pose a serious threat to the safety of the American people. The UAS threat could take a number of forms, including illicit surveillance, chemical/biological/radiological attacks, traditional kinetic attacks on large open air venues (concerts, ceremonies, and sporting events), or attacks against government facilities, installations and personnel. Sadly, these threats are not merely hypothetical. The FBI is concerned that these deadly tactics—perfected overseas—will be performed in the homeland. That threat could manifest itself imminently.