Convertiplanes are hybrid aircraft that can transform from vertical take-off and landing planes to fixed-wing airplanes. They are sometimes referred to as "tiltrotor" or "tiltwing" aircraft due to their unique abilities to change their flight mode. Other synonyms for the term "convertiplane" include "vertical takeoff and landing aircraft" (VTOL), "compound helicopter," "quadrotor," and "hybrid aircraft." In the military, they are often called "multi-service tactical transport aircraft" or "airborne multi-purpose system." A convertiplane has been used in various applications, including military reconnaissance, rescue, and commercial transportation, making them an essential innovation in the world of aviation.