A defense budget is the amount of money a government allocates for its military and national security. This budget covers various expenses, including personnel salaries, equipment purchases, training, and maintenance of military facilities. Countries create these budgets to ensure they can protect their citizens and respond to potential threats. Governments often review and adjust their defense budgets based on current geopolitical situations and security needs. For example, the United States and China regularly update their budgets to address emerging challenges and maintain their military capabilities. These budgets reflect a nation's priorities and commitment to defense and security.