The term "sovereign" refers to a supreme ruler or authority, often used to describe a king or queen who holds ultimate power over a state or territory. In a broader sense, it can also refer to a nation that governs itself without external control, emphasizing its independence and autonomy. In political theory, sovereignty is a key concept that signifies the full right and power of a governing body to govern itself without interference. This principle is fundamental to the idea of nation-states, where each country has the authority to make its own laws and decisions, reflecting the will of its people.