De-icing fluid is a specialized liquid used to remove ice and snow from aircraft surfaces before takeoff. It helps ensure safe flying conditions by preventing ice buildup on wings and other critical areas. The fluid typically contains a mixture of water and glycol, which lowers the freezing point and allows for effective melting of ice. There are two main types of de-icing fluids: Type I and Type II. Type I is heated and applied to remove existing ice, while Type II is thicker and provides longer-lasting protection against ice formation during flight. Proper application is essential for maintaining aircraft safety.