The hydrologic cycle, also known as the water cycle, is a continuous process by which water moves through different stages on Earth. It involves evaporation from bodies of water and moist surfaces, condensation into clouds, precipitation in the form of rain or snow, runoff into rivers and oceans, and finally, evapotranspiration from plants and soil. This cycle is essential for maintaining a balance of water on Earth and plays an important role in regulating climate patterns.