A hair curler is a styling tool designed to create curls or waves in hair. It typically consists of a heated barrel that comes in various sizes, allowing users to achieve different curl styles. Most curlers have a clamp to hold the hair in place while it heats, and they can be made from materials like ceramic, tourmaline, or metal. Using a hair curler involves wrapping sections of hair around the heated barrel for a few seconds, depending on the desired curl tightness. Many modern curlers also feature adjustable temperature settings and automatic shut-off functions for safety and convenience.