Drones
A drone is a type of unmanned aerial vehicle (UAV), which is an aircraft without a human pilot, crew, or passengers. Unmanned aerial vehicles (UAVs) are a part of unmanned aircraft systems (UAS), which also include the addition of a controller on the ground and a communications network with the UAV.
Despite the fact that drones have been employed in warfare at least since the First World War, the modern, lethal drone is a far more recent innovation. The first lethal drone strike was conducted shortly after 9/11, and since then, insurgencies and irregular conflicts have supplanted more conventional forms of warfare on a battlefield that is always evolving.
Given that most contemporary models can fly undetected for days at a time and carry out their killings precisely, the killer drone could be categorized as a sniper in terms of weaponry. The fact that they don't require actual boots on the ground for combat operations has fundamentally altered the way wars are conducted. While there has been some debate surrounding the general accuracy of drones, they are also significantly more accurate than bombs or artillery projectiles.