Soap is defined by chemistry as the salt of a fatty acid. Soap is mainly used for washing, bathing and cleaning. Soaps create a stable but heterogeneous emulsion of fats that are fats, creating an emulsion colloid that binds the soap molecules to the fats from the alkyl (long carbon chain) portion and the soap from the polar head itself to the water molecules to wash away the fats. (The charged part of the soap disperses the fats into the water and attracts the water, which is “polar”, and the hydrocarbon part also attracts the fats).