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Soap is a cleansing and emulsifying product made primarily from the reaction between fats or oils and an alkali (commonly sodium hydroxide or potassium hydroxide). It helps remove dirt, oils, and impurities from the skin and surfaces by breaking them down and allowing them to be rinsed away with water. Soap can come in various forms—bar, liquid, foam, or gel—and is often enhanced with fragrances, moisturizers, and antibacterial agents.