A hair straightener is an electrical device used to smooth and straighten hair. It typically consists of two heated plates that clamp together, allowing users to glide the device down sections of hair. Hair straighteners come in various sizes and materials, such as ceramic, titanium, or tourmaline, which can affect the heat distribution and overall results. Many people use hair straighteners to achieve a sleek, polished look for their hair. They can also help reduce frizz and enhance shine. To protect hair from heat damage, it is often recommended to use a heat protectant spray before styling with a hair straightener.