A sunset occurs when the sun dips below the horizon, marking the end of the day. This natural phenomenon is caused by the rotation of the Earth, which causes the sun to appear to move across the sky. As the sun sets, its light passes through more of the Earth's atmosphere, scattering shorter wavelengths and creating vibrant colors like orange, pink, and purple. Sunsets can vary in appearance depending on weather conditions, geographic location, and the presence of particles in the atmosphere. Clouds, pollution, and aerosols can enhance the colors, while clear skies may result in a more subdued display. Many people enjoy watching sunsets for their beauty and tranquility.