A city skyline is the outline of a city's buildings and structures against the sky, often seen from a distance. It typically features a mix of tall skyscrapers, mid-rise buildings, and sometimes historical landmarks. The skyline can vary greatly depending on the city's architecture, geography, and urban planning. Skylines are often iconic and can represent a city's identity, such as the New York City skyline with its famous Empire State Building or the Chicago skyline known for its unique Art Deco architecture. They are popular subjects for photography and art, especially during sunrise or sunset when the light enhances their beauty.