Which styling tool is used for creating curls?

The curling iron is specifically designed for creating curls in the hair. Its structure typically includes a heated barrel and a clasp, which allows the stylist to wrap sections of hair around the barrel to achieve various types of curls and waves. The temperature settings on curling irons often vary, allowing for customization based on hair type and desired curl style. The focused heat from the barrel helps in setting the curl effectively, making it a go-to tool in styling for achieving defined, bouncy curls.

While flat irons can create waves or curls through techniques like bending the hair at different angles, their primary function is to straighten hair, which does not align with the intention of creating curls. A blow dryer is primarily used for drying hair and can potentially enhance waves when used with a diffuser, but it does not curl hair by itself. A round brush is typically used in conjunction with a blow dryer to add volume and smoothness but is not specifically designed for curling purposes either. Thus, the curling iron stands out as the most appropriate tool for creating curls.