The main source of freshwater on Earth is found in glaciers and polar ice caps, which hold about 68.7% of the world's freshwater supply. Other significant sources include groundwater, rivers, and lakes, although the majority is trapped in ice and is not readily accessible. Freshwater is vital for all forms of life and is critical for drinking, agriculture, and industry. The management and conservation of this limited resource are vital to sustaining ecosystems and human populations.