An empire is a large political structure that extends its control over vast territories and diverse populations, often through conquest or colonization. Empires have played a significant role in shaping world history, influencing cultures, economies, and political systems. Notable examples include the Roman Empire, the British Empire, and the Ottoman Empire. Empires typically consist of a central authority that governs various regions, often leading to complex relationships between the ruling power and its subjects. The legacy of empires can still be seen today in the borders of modern nations and the cultural exchanges that occurred during their reigns.