Glycerin (C₃H₈O₃) is a colorless, odorless, and sweet-tasting viscous liquid widely used in food, pharmaceuticals, and cosmetics. It acts as a humectant, helping to retain moisture in products, making it ideal for skincare formulations. Glycerin also serves as a solvent and thickening agent in various applications. Its non-toxic nature and versatility make it a popular choice across multiple industries.