A regime refers to a system of government or a set of rules and practices that dictate how power is exercised within a state. Regimes can vary widely, from democratic systems where leaders are elected by the people, to authoritarian regimes where power is concentrated in the hands of a few. The nature of a regime influences the political, social, and economic life of a country. Regimes can also be categorized based on their stability and duration. Some regimes are short-lived, often resulting from revolutions or coups, while others may endure for decades. Historical examples include the Soviet Union under Joseph Stalin and the United States with its democratic regime. Understanding regimes helps in analyzing global politics and governance.