Lye is an alkali metal hydroxide that is used for various purposes. It is most commonly known as sodium hydroxide (NaOH) and is used in soap making, food preparation, and the production of household and industrial cleaning products. In the food industry, lye is used to cure various types of food, including olives, mandarin oranges, hominy, and pretzels. It is also used in the production of commercial and industrial cleaners, clogged drain openers, and in the tissue digestion process. Lye is an essential ingredient in soap making, as it is used to create a chemical reaction with oils and fats to produce soap. It is important to note that lye should be handled with care, as it is a caustic substance that can cause damage to the skin and eyes if not used properly