What is caster salt?

Caster salt, more commonly known as caster sugar, is a fine sugar that is often used in baking and desserts due to its ability to dissolve quickly. It is typically made from granulated sugar that has been ground to a finer texture, making it ideal for recipes where smoothness is desired, such as cake batters and meringues. In some regions, it can refer to a type of salt used for seasoning, but primarily, it is associated with sugar in culinary contexts.