A biscuit cutter is a tool used to create shapes in dough before it is baked into biscuits. It typically has an handle and a removable cutting die that can be pressed into the dough to make various designs, such as circles or stars. The shape of the biscuit depends on which side of the cutter is used, with one side usually having a smooth surface for cutting out the biscuit while the other side has a pattern imprinted onto it.