A triglyceride is composed of:

* Glycerol: A three-carbon alcohol molecule.

* Three fatty acids: Long chains of hydrocarbons with a carboxyl group at one end.

The fatty acids attach to the glycerol molecule through ester bonds.

Types of fatty acids:

* Saturated fatty acids: Have no double bonds between carbon atoms in their chains. They are typically solid at room temperature.

* Unsaturated fatty acids: Have one or more double bonds between carbon atoms in their chains. They are typically liquid at room temperature.

Therefore, fat is essentially a combination of glycerol and fatty acids, forming triglycerides.