What styling tool is primarily used for creating curls in the hair?

Hot rollers are primarily designed for creating curls in the hair. They consist of cylindrical heated rollers that are used to set the hair into waves or curls. Once the hair is wrapped around these rollers and allowed to cool, it retains a curly shape, providing volume and bounce to the hairstyle. This method is particularly effective for achieving smooth, defined curls, making it a popular choice for styling.

In contrast, blow dryers are used mainly for drying hair, and while they can be styled to create waves or volume, they do not inherently create curls. A flat iron is primarily intended for straightening hair, but it can create curls by using a specific technique, though it's not its primary function. A diffuser is an attachment for blow dryers that helps to distribute heat evenly while minimizing frizz, usually used for enhancing natural curls rather than creating them from straight hair. Thus, while other tools have their purposes, hot rollers are the go-to option specifically for curling hair.