Unmanned Combat Aerial Vehicle (UCAV)
A UCAV is an aerial combat drone. If you cannot remember what a drone is, check here.
Extending the definition of a drone, here is how we define unmanned aerial vehicles:
A combat vehicle that is capable of flight without requiring a human to be onboard is a UCAV. They may be operated remotely by humans or may be capable of autonomous flight and are used by military forces.
What are the most common combat drones today?