Straighteners, commonly known as hair straighteners or flat irons, are electrical devices used to straighten curly or wavy hair. They work by applying heat to the hair strands, which alters their structure and makes them smoother and straighter. Most straighteners have adjustable temperature settings to accommodate different hair types and minimize damage. These tools typically consist of two heated plates that clamp together to press the hair. Many straighteners also feature advanced technologies, such as ceramic, tourmaline, or ionic coatings, which help distribute heat evenly and reduce frizz. Proper use can lead to sleek, polished hairstyles.