Anti-icing fluid is a specialized liquid used primarily in aviation to prevent the formation of ice on aircraft surfaces. It is applied before takeoff to ensure that ice does not accumulate on wings, tail, and other critical areas, which can affect flight safety and performance. This fluid typically contains a mixture of water and chemicals, such as glycol or propylene glycol, which lower the freezing point of water. By using anti-icing fluid, airlines can maintain safe flying conditions during winter weather, ensuring that aircraft are ready for takeoff without the risk of ice-related issues.