A curling iron is a hair styling tool used to create curls or waves in the hair. It typically consists of a heated metal barrel that comes in various sizes, allowing users to achieve different curl styles. The hair is wrapped around the barrel, and the heat helps to set the curl. Many curling irons also feature adjustable temperature settings to accommodate different hair types. Curling irons can be made from various materials, including ceramic, tourmaline, and titanium, each offering unique benefits. Some models come with additional features, such as automatic shut-off for safety and built-in timers to prevent overheating. Proper use of a curling iron can enhance hairstyles for various occasions.