Powdered sugar, also known as confectioners' or icing sugar, is a finely pulverized sugar that dissolves quickly and is often used to provide a thin, white decorative coating. To prevent it from absorbing moisture in the air and caking, manufacturers often add a little cornstarch. Store sugar indefinitely in an airtight container.
For other types of sugar, see brown, coarse, demerara, granulated, palm, pearl, raw, and superfine sugars, and colored sugar crystals and multicolored sprinkles.