Aircraft design is the process of creating and developing aircraft, focusing on their structure, systems, and performance. Designers consider factors like aerodynamics, materials, and safety to ensure the aircraft can fly efficiently and reliably. The design process involves various stages, including conceptual design, detailed design, and testing. Engineers use computer simulations and wind tunnel tests to evaluate how the aircraft will perform in different conditions. Ultimately, the goal is to produce a safe and effective vehicle for transporting passengers and cargo.