Guar is a four-letter thickening agent derived from the guar bean, which is native to India and Pakistan. It is used in many food products, such as ice cream, sauces, and dressings, as well as in cosmetics and pharmaceuticals. Guar gum is a polysaccharide composed of galactose and mannose sugars, and it is known for its ability to form gels when combined with water. It is also used as an emulsifier and stabilizer, helping to keep ingredients from separating.