Lipids are a diverse group of organic compounds that are insoluble in water but soluble in organic solvents. They include fats, oils, waxes, and steroids, and play essential roles in the body, such as energy storage, insulation, and forming cell membranes. Lipids are made up of fatty acids and glycerol, which can vary in structure and function. In addition to their biological importance, lipids are also found in many foods, contributing to flavor and texture. Common sources of lipids include butter, olive oil, and avocados. Understanding lipids is crucial for nutrition and health, as they are vital for various bodily functions.