Sodium hydroxide, often called lye or caustic soda, is a strong alkaline compound with the chemical formula NaOH. It is commonly used in various industries, including soap making, paper production, and water treatment. When dissolved in water, it creates a highly basic solution that can effectively neutralize acids and break down organic materials. This compound is also important in household cleaning products, as it can help remove grease and unclog drains. However, sodium hydroxide is highly corrosive, meaning it can cause burns if it comes into contact with skin. Therefore, it is essential to handle it with care and use protective gear when working with it.