The fuselage is the main body of an aircraft, designed to hold passengers, cargo, and the cockpit. It provides structural support and houses essential systems for flight. The shape of the fuselage is typically cylindrical, which helps reduce aerodynamic drag during flight. In addition to its structural role, the fuselage also connects the wings and tail of the aircraft. It is built using lightweight materials like aluminum or composite materials to enhance fuel efficiency. The design of the fuselage is crucial for the overall performance and safety of the aircraft, making it a key component in aviation engineering.