Icing sugar, also known as confectioner's sugar or powdered sugar, is a fine powder made from pulverized granulated sugar. It is commonly used to make various sweet treats, including cakes, cookies, and pastries. Other synonyms for icing sugar include powdered icing sugar, caster sugar, and snow sugar. In some regions, it may also be referred to as fondant sugar, which is used specifically for making fondant. Regardless of its name, icing sugar remains a popular ingredient in the kitchen due to its ability to dissolve quickly and blend seamlessly with other ingredients. Whether you prefer to call it confectioner's sugar or caster sugar, this ingredient will always be a staple in sweet creations.