New York is the most populous city in the United States of America and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. The city is referred to as New York City or The City of New York to distinguish it from the State of New York, of which it is a part. A global power city, New York exerts a significant impact upon commerce, finance, media, art, fashion, research, technology, education, and entertainment. The home of the United Nations Headquarters, New York is an important center for international diplomacy and has been described as the cultural capital of the world.