The correct answer is "it carries out remote attacks".
Military Drones are a development which aims to perform military tasks without the presence of personnel in certain areas. This is a massive improvement, as extends the range of maneuverability that an army can have in conflict zones but most importantly, it prevents military personnel to be directly exposed to death-provoking threats.
Since its introduction, drones have adopted numerous roles for civil commercial use. it is an industry which is in constant growth.