A quadcopter is a multirotor helicopter that uses four rotors to generate lift and thrust. It requires an onboard computer called a flight controller to stabilize flight since multirotors are inherently unstable. To build a basic quadcopter, you need a multicopter frame, four motors and propellers, electronic speed controllers to control motor speed, a radio transmitter and receiver to control it, batteries, and a battery charger. Quadcopters have many uses like delivery by Amazon, aerial photography, firefighting, search and rescue, security, inspection, and science/research. The future of drones is promising as technologies like self-flying vehicles could revolutionize transportation.