National defense refers to the national defense, which refers to the military and military-related political, diplomatic, economic, cultural and other aspects of construction in order to defend national sovereignty and territorial integrity and guard against foreign aggression and subversion. and struggle. The ancients regarded etiquette and justice as a force to maintain the security of society and the country, which must be strictly observed and prevented from being overstepped, which is called national defense. Today, it refers to all measures taken to protect the country's sovereignty, territorial integrity and security, and to defend against foreign armed aggression and subversion. National defense service seal of the Chinese People's Liberation Army. Significance: National defense emerged with the establishment of the country and serves national interests. Churchill has a famous saying: Chinese People's Armed Police Force National Defense Service Medal: "We have no eternal friends, no eternal enemies, only eternal interests." This statement is true. National defense is directly related to national security, national dignity, and social development. 1. The main body of national defense: the state. 2. The purpose of national defense: to defend national sovereignty, unity, maintain national security, and defend the country’s territorial integrity. 3. Means of national defense: military, political, economic, diplomatic, etc. 4. Objects of national defense: aggression and armed subversion. Importance: A country cannot stand without defense, and its people are insecure without defense. As a country and a nation, the most important things are nothing more than two major issues, one is development and the other is security. National defense is the product of the development and security needs of human society. It is a fundamental plan related to the life and death of the country and the nation. Modern national defense is also called social national defense, major national defense, and all-people national defense. It includes many aspects such as armed construction, national defense system, military science and technology, national defense equipment and industry, national defense engineering, military transportation and communications, manpower mobilization, national defense education, and national defense laws and regulations. It is a large and complex system. From the supreme head of state to every citizen, from military to politics, economy, culture, education, science and technology and ideology, they are all closely related to it. Modern national defense takes military strength as its core, and also includes related non-military forces; it attaches great importance to the country's war potential, especially its wartime mobilization efficiency; it is also a competition of comprehensive power based on economy and science and technology. The modern army is a knowledge- and technology-intensive armed group that emphasizes quality army building over "human sea tactics." The role of national defense in peacetime is to deter, requiring victory without fighting; in wartime, the responsibility of national defense is to conduct actual combat, and the goal is victory. Function: ⑴ National security guarantee. ⑵The premise of national independence. ⑶Important conditions for national prosperity and development. Four types: expansion type. In order to safeguard their own interests around the world, major powers pursue hegemony and invade, subvert and infiltrate other countries. Defense equipment Self-defense type. It mainly relies on its own strength and strives for extensive international support to prevent invasion by foreign enemies and maintain its own security. Our country adheres to the principle of peaceful and independent defense, will never expand, and will not allow other countries to invade an inch of our land. Alliance type. In the form of alliances, we unite with other countries to make up for our own shortcomings. It can be divided into expansion and self-defense types, and can also be divided into unitary and multiple alliances. The former has a big country as the leader. Neutral type. Small and medium-sized developed countries strictly adhere to the peaceful and neutral defense policy, formulate an overall defense strategy and a defense system for the deployment of troops and civilians. Such as Switzerland. China's national defense is active defense and self-defense. The international situation is gradually easing, but hegemonism and power politics are still rampant. Being prepared for danger in times of peace, our country must not only accelerate development but also ensure safety. "National wealth" and "military strength" are the two pillars that enable our country to stand among the nations of the world. Basic Characteristics Modern national defense is the embodiment of a country’s comprehensive national strength. A country's comprehensive national strength includes: national strength, national potential, and the ability to transform potential into strength. The country fully utilizes various conditions and capabilities for national defense equipment and transforms various conditions and capabilities into national defense strength as quickly and effectively as possible. This is an important indicator of the strength of the country's comprehensive national strength. Modern national defense is a competition of multiple forms of struggle. Modern national defense still takes military struggle as its basic form. At the same time, non-military struggles such as politics, economy, science and technology, and diplomacy are becoming more and more intense, and their role is becoming increasingly important. Modern national defense is both a national act and an international act. The state behavior of national defense is mainly manifested in: the country uses various conditions and capabilities to build national defense; relying on strong national defense, the government can concentrate on formulating policies, mobilize all forces to develop the economy, and ensure national prosperity. We are prosperous and strong, and our people live and work in peace and contentment. The main manifestations of the international behavior of national defense are: domestic and foreign countries, national defense and the international are more closely linked; world peace and war, international economic prosperity and recession all directly affect the country and national defense construction; the international and peripheral situations are turbulent, and the country must be involved in national defense We must pay more attention to it. Once we encounter external threats or aggression, we must mobilize national defense forces to meet external challenges. Modern national defense has multi-level goals. The lowest-level goal is self-defense. The scope of national defense is limited to the national territory and territorial waters and focuses on safeguarding national sovereignty and territorial integrity. Intermediate-level goals are regional goals, which are limited to a limited surrounding area outside the country's territory, focusing on increasing the depth and flexibility of national defense and creating a more relaxed surrounding environment for the country's security and development. The highest-level goals are global goals, with national defense covering the entire globe and focusing on protecting the country's interests around the world. Enlightenment 1. Strong national defense is the basic condition for the survival and development of the country and the nation; 2. Correctly handling the relationship between national defense construction and economic construction is an important prerequisite for building strong national defense; 3. Science and technology are the fundamental driving force for building strong national defense. 4. The masses of the people are the source of strength for building a strong national defense; 5. Upholding the leadership of the party and building a modern revolutionary army that is loyal to the party and the people are the fundamental guarantee for building a strong national defense.

6. Economic development is the foundation for strong national defense. 7. Political prosperity is the foundation for consolidating national defense. 8. The unity of the country and the unity of the nation are the keys to a strong national defense.