Glycerin also known a glycerol is simple polyol compound basically obtained from plant sources where it occurs in triglycerides, ester
of glycerol with long chain carboxylic acids.

Application:

Food industry : Glycerin served as a humectants, sweetener and solvent. May be used as a food preserver. 

Medical and pharmaceuticals : due to its anti microbial, anti viral property it is widely used to treat wounds. It can also be used as an effective marker to measure liver diseases

Personal care : For making soaps for people suffering from skin irritation or people who have highly sensitive skin.