Fats are molecules that are made up of glycerol and fatty acids, which are combined in different ways to form different fats.
A fatty Acid is a long carbon chain with the end carbon double bonded to oxygen and to a hydroxyl (OH) to form a carboxylic acid. Fatty acids vary in length and in the number and location of double bonds. Three fatty acids linked to a glycerol molecule form fat.
There are three classes of fats namely; triglycerides, phopholipids, and sterols. Triglycerides are made up of three fatty acids and a glycerol backbone, like the figure above.