Final answer:
A permanent wave technique, also known as a perm, is a type of permanent hairstyle that involves setting the hair using either thermal or chemical methods.
Step-by-step explanation:
A permanent wave technique, also known as a perm, is a type of permanent hairstyle that involves setting the hair using either thermal or chemical methods. In a chemical perm, chemicals are applied to the hair to create curls or waves, while in a thermal perm, heat is used to achieve the desired style. The process of perming involves breaking and reforming disulfide bonds in the hair, which allows the hair to retain a new curl pattern.