What is the best icing sugar to use for piping?

For piping, you should use confectioner's sugar, also known as icing sugar or powdered sugar, which is a finely ground sugar that results in a smooth and consistent consistency. It is important to use icing sugar specifically designed for piping as it contains cornstarch or other anti-caking agents that help prevent clumping and ensure a smooth flow through the piping bag. Regular granulated sugar, on the other hand, is not suitable for piping as its larger crystals can clog the piping tip and result in an inconsistent texture.