A "Twin-Engine" refers to an aircraft that is powered by two engines. This design enhances performance, providing better thrust and redundancy in case one engine fails. Twin-engine planes are commonly used for commercial flights, cargo transport, and military operations, offering a balance of speed and efficiency. In aviation, twin-engine aircraft can vary in size and purpose, ranging from small regional jets to larger airliners like the Boeing 737. They are often favored for their ability to operate on shorter runways and their improved fuel efficiency compared to larger, single-engine planes.