The Day-Night Cycle is the regular pattern of light and darkness that occurs on Earth due to its rotation on its axis. As the planet spins, different areas receive sunlight while others are in shadow, creating daytime and nighttime. This cycle takes about 24 hours to complete, resulting in a consistent rhythm of light and dark. The Sun plays a crucial role in this cycle, providing light and warmth during the day. As the Earth rotates, the position of the Sun changes in the sky, leading to variations in daylight hours throughout the year. This cycle affects weather, ecosystems, and human activities.