Lipids are generally defined as nonpolar compounds in the body that are possessing properties of being hydrophobic and amphiphilic. Lipids play an essential role in living organisms because they comprise the formation of cellular membranes, hormones, vitamins, and most especially energy storage.
There are a wide classification of lipids. Examples are fatty acids in monoglycerides, diglycerides and triglycerides. Other examples are cholesterol, vitamins, waxes, and other phospholipids. The general structure of common lipids in the body like triglycerides and phospholipids are shown in the pictures attached.