Ruwa wani tataccen sinadari ne wanda yake da matukar muhimmanci a wurin halittun Duniya baki daya kama daga kwari, tsuntsaye, halittun ruwa dana doron kasa. A turance ana kiransa water, Hakika Ruwa ya kasance shine kinshikin rayuwar halittun duniya baki daya, ruwa shine tubalin ginin kwayar duk wata halitta a doron duniya.