Hydrophilic is the name given to a polar group that interacts favorably with water.
The concept originates from the observation that “like dissolves like”. That is, a polar molecule is soluble dissolves in a polar solvent while a non-polar molecule is soluble in a non-polar solvent. Hence, polar molecules that readily dissolves in water (water is a polar molecule) are called hydrophilic.
Examples – Polar groups of salts and soap.