The document discusses the use of composites in the aerospace industry. Composites are materials made of two or more materials combined to produce new properties. They are lighter than metals but also strong. This makes them advantageous for aircraft to reduce weight. Common composites used include carbon fiber, fiberglass, and glass laminate. Applications in aircraft include fuselages, wings, rotor blades, and more. Composites allow for weight savings in structures like the Boeing 787 and Airbus A380. Space vehicles also use composites for components like rocket motor cases. Future developments may include honeycomb structures and hybrid composite materials.