Fuselage design refers to the process of creating the main body of an aircraft, which houses passengers, cargo, and essential systems. The fuselage must be strong yet lightweight to withstand various forces during flight. It typically has a streamlined shape to reduce drag and improve fuel efficiency. Materials like aluminum and composite materials are commonly used to achieve the right balance of strength and weight. In addition to structural integrity, fuselage design also considers aerodynamics and safety. Features such as windows, doors, and emergency exits are strategically placed to enhance functionality. The design must comply with regulations set by organizations like the Federal Aviation Administration (FAA) to ensure passenger safety and comfort.