Because of the tendency to dissolve almost all the substances, water is regarded as the universal solvent.
Ionic compounds or polar compounds dissolve in it because of its high dielectric constant(78.39)
Covalent compounds are soluble in it because of the formation of hydrogen bonds between the water and covalent molecule.
Solvent: The component usually present in the larger quantity of the solution that dissolves the other component in it is called the solvent, it can be a gas, liquid,