External sovereignty refers to the recognition and respect of a state's authority and independence by other states in the international system. This concept is central to the Westphalian model, which established the principle of state sovereignty as a foundational element in international relations, emphasizing that states are equal entities with the right to govern themselves without outside interference. The recognition of external sovereignty is crucial for states to engage in diplomacy, trade, and treaties, as it legitimizes their actions and interactions on the global stage.