Hair straightening is a hair styling process that transforms curly, wavy, or frizzy hair into a smooth, sleek, and straight appearance. This can be achieved temporarily using flat irons, hot combs, or blow dryers, or permanently through chemical treatments like keratin treatments, relaxers, or Japanese hair straightening. The goal is to alter the hair's structure to make it easier to manage, style, and maintain a polished look. While it offers aesthetic benefits, frequent heat or chemical straightening can potentially damage hair over time if not done with proper care and protection.