Fats 

Fats are esters of long chain fatty acids and an alcohol called glycerol. The fats are actually made up of three elements carbon, hydrogen and oxygen. Fats are one of the three main macro-nutrients along with carbohydrate and protein.

Every fat molecule consists of three molecules of a fatty acid and one molecule of glycerol. Fats are the members of a heterogeneous group of organic compounds known as lipids. The main function of fats in the body is to provide a steady source of energy

https://www.qries.com/What-are-fats-and-lipids-What-are-their-advantages-and-disadvantages/answer/Daneel-Yunus