The water cycle, also known as the hydrological cycle, refers to the continuous movement of water on, above, and below the Earth's surface. This vital process ensures that the world's water supply is constantly recycled and replenished. Other synonyms for the water cycle include the hydrologic cycle, the water cycle process, and the evaporation-condensation cycle. The term 'water cycle' is often used in scientific and educational settings, while the terms 'hydrologic cycle' and 'evaporation-condensation cycle' are more commonly used in technical or professional contexts. Regardless of terminology, understanding and proper management of the water cycle is critical for sustaining life on Earth.