Explain the composition of triglyceride?

Triglycerides are composed of two types of molecules, i.e., glycerol (3 carbon molecules) and
fatty acids which is attach to the glycerol at the alcohol Unit. The following is a structural representation of a triglyceride at the molecular level.
Fatty acids are chains of hydrocarbons composed 4-22 (or more) carbons along with a carboxyl group at one end. If each carbon has two hydrogen atoms, the fatty acid is saturated. If two carbon atoms are double-bonded, so, that there is less hydrogen in the fatty acid, it is unsaturated (monounsaturated). If more than two carbon atoms are unsaturated, the fatty acid is polyunsaturated.