Water is an universal solvent. it can found in solid, liquid or gaseous state. it is a necessary component in human body, without water life can't exist. it performs many functions in body. it aids in digestion and also helps in excretion. it maintains homeostasis level of body. it also maintains pH of body. it maintains constant body temperature. it helps in glycolysis in body which provide energy to do work.

water is also necessary for plants and crops. in plants it helps in photosynthesis and helps plants to make their own food. water also helps plants for reproduction purpose and also role in cross pollination.

Like fire, air and soil, water is also a necessary component of earth.