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Lipids are a class of organic molecules that are not soluable in water, but are soluable in all non-polar solvents. Lipids are hydrophobic (water-fearing) and lipophilic (fat-loving). In general they are largely nonpolar. They include waxes, oils, fats, and steroids. Lipids are used by the body for signaling, storing large amounts of energy, and as structural components of cell membranes. All lipids can be divided into seven classes; however, only six of them have a level of biological significance: fatty acids, waxes, glycerides, phospholipids, prostogladins, and steroids. The specific function and structure of each class is discussed in other Expii subtoppics.