Superfine sugar, also known as caster sugar, is a type of sugar that has been ground to a finer texture than regular granulated sugar. This fine consistency allows it to dissolve quickly, making it ideal for recipes that require a smooth texture, such as meringues and certain cocktails. It is commonly used in baking and cooking, as it blends easily into batters and doughs. Superfine sugar can be found in most grocery stores and is often used by professional bakers for its ability to create light and airy confections.