What is the role of castor sugar in baking recipes and how does it differ from other types of sugar?

Castor sugar is often used in baking recipes because of its fine texture, which helps it dissolve quickly and evenly in batters and doughs. This results in a smoother texture in the final baked goods. Castor sugar is finer than granulated sugar but not as fine as powdered sugar. It also caramelizes more quickly than granulated sugar, which can affect the color and texture of baked goods.