Water is a universal solvent because it can dissolve more substances than any other liquid. Water is a polar molecule because it is composed of the positively charged element of hydrogen and the negatively charged element of oxygen. This property of water is very important because it transports the nutrients animals and plants need to survive.
Water is able to dissolve almost any molecule or substance. For example, table salt is very easy to dissolve in water. The positively charged sodium is attracted to the negatively charged oxygen and the negatively charged chlorine is attracted to the positively charged hydrogen.
Water's chemical composition and physical attributes make it easier for it to attract another substance. Water's attraction to a certain substance can become so heavy that it disrupts the chemical bond of the other molecule and it dissolves it.