A 4-axis drone typically refers to a quadcopter, which is equipped with four rotors. These drones are known for their stability and maneuverability, making them popular for various applications like aerial photography, racing, and recreational flying. The four rotors allow for vertical takeoff and landing (VTOL), and the drone can be controlled using a remote or smartphone app. Key features often include GPS, camera capabilities, and sometimes advanced sensors for obstacle avoidance.