Glycols are a group of organic compounds that contain two hydroxyl (-OH) groups. The most common types are ethylene glycol and propylene glycol. These substances are colorless, odorless, and have a sweet taste. They are widely used in various industries, including automotive, pharmaceuticals, and food processing, due to their ability to absorb moisture and act as solvents. In addition to their industrial applications, glycols are also used in antifreeze formulations to lower the freezing point of liquids. They play a crucial role in preventing engine damage in vehicles during cold weather. Furthermore, propylene glycol is often found in food products and cosmetics as a safe additive.