Autonomous Territorial Units are regions within a country that have a degree of self-governance and administrative independence. These units can create their own laws and manage local affairs while still being part of the larger nation. Examples include regions like Catalonia in Spain and Puerto Rico in the United States. The level of autonomy can vary significantly, with some units having control over areas like education and health, while others may have limited powers. Autonomous Territorial Units often arise from historical, cultural, or linguistic differences, allowing them to maintain their unique identities within the framework of the state.