Lipid-based compounds are organic molecules primarily composed of carbon, hydrogen, and oxygen. They are hydrophobic, meaning they do not mix well with water. Common types of lipids include fats, oils, waxes, and steroids. These compounds play essential roles in biological systems, such as energy storage, cellular structure, and signaling. In living organisms, lipids are crucial for forming cell membranes, which protect and organize cells. They also serve as energy reserves, providing more than double the energy per gram compared to carbohydrates. Additionally, lipid-based compounds are involved in the synthesis of hormones and vitamins, contributing to overall health and metabolism.