The Aerospace & Defense industry is a global industry that designs, manufactures, and services aircraft, spacecraft, missiles, weapons, and other defense systems. It is a highly regulated industry that is subject to government oversight and regulation. The industry is composed of a variety of companies, ranging from large defense contractors to small aerospace startups. The industry is driven by technological advances, such as the development of new materials and propulsion systems, as well as the need for increased security and defense capabilities. The industry is also heavily reliant on government contracts and funding.