Drones, which are also called unmanned aerial vehicles (or UAVs), are contraptions that take to the air without human pilots in the cockpit. Instead, people control drones from the ground or, increasingly, the drones simply fly themselves without the need for human intervention.

To the military, they are UAVs (Unmanned Aerial Vehicles) or RPAS (Remotely Piloted Aerial Systems). However, they are more commonly known as drones. Drones are used in situations where manned flight is considered too risky or difficult. They provide troops with a 24-hour "eye in the sky", seven days a week.

Amazon's next big idea is the deploy an army of drones to deliver packages over a wide area in as little as 30 minutes. Prime Air was unveiled as a concept several years ago, but Amazon is still developing it. ... 
Still, most things Amazon sells weight less than five pounds