A "Permanent Wave" is a hairstyling technique that creates curls or waves in the hair using chemical processes. This method involves applying a solution that breaks down the hair's natural structure, allowing it to be reshaped around rods or curlers. Once the desired shape is achieved, a neutralizing solution is applied to set the curls in place. The process can last several months, making it a popular choice for those seeking long-lasting waves without daily styling. The term is often abbreviated to "perm." While it can be used on various hair types, results may vary based on the hair's texture and condition.