What is the chemical structure of fat.

Fats are made of fatty acids and glycerol which combine
with a dehydration reaction. Fats are differentiated by the fatty acid that is present
in them. Fatty acids are formed of the elements carbon, hydrogen and oxygen and are
linked together to form a carbon chain. At the end of each carbon chain is a carboxyl
group (-COOH).

Fats are divided into various categories
based on the number of bonds that the carbon atoms in the fatty acids have, saturated
fatty acids have all the hydrogen atoms that the carbon atoms can hold and no double
bonds between the carbon atoms.  Fatty acids which have only one double bond are called
monounsaturated and those which have more than one double bond are called
polyunsaturated fatty acids.