The defense industry, also called the military industry, is comprised of government and commercial industry involved in research, development, production, and service of military equipment and facilities. It includes:

• Defense contractors: business organizations or individuals that provide products or services to a defense department of a government.
• The Arms industry, which produces guns, ammunition, missiles, military aircraft, and their associated consumables and systems.

It can also include:

• Private military contractors: private companies that provide logistics, manpower, and other expenditures for a military force.
• European defence procurement, which is more or less analogous to the U.S. "military-industrial complex."