Simple lipids are organic compounds primarily made up of fatty acids and glycerol. They are the most basic form of lipids and include substances like triglycerides and waxes. Simple lipids serve as energy storage molecules and play a crucial role in maintaining cell structure. These lipids are hydrophobic, meaning they do not mix well with water. Simple lipids are found in various foods, such as oils and fats, and are essential for various biological functions, including insulation and protection of organs. Their structure allows them to store energy efficiently for later use by the body.