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National defense refers to a country's military activities to guard against and resist aggression, stop armed subversion, and defend national sovereignty, unity, territorial integrity and security, as well as military-related political, economic, diplomatic, scientific and technological, educational and other activities.

Modern national defense, also known as social national defense, great national defense and national defense, is a huge and complex system, including armed construction, national defense system, military science and technology and industry, national defense engineering, military transportation and communication, manpower mobilization, national defense education and national defense laws and regulations. From the top leaders to every citizen, from the army to politics, economy, culture, education, science and technology, and ideology, it is closely related to it.