A cold perm is a hair treatment that creates curls or waves without the use of heat. Instead, it relies on chemical solutions to break down the hair's internal structure, allowing it to be reshaped. The process typically involves wrapping the hair around rods and applying a cold perm solution, which helps set the new shape as it dries. This method is often preferred for its ability to produce softer, more natural-looking curls compared to traditional heat perms. Cold perms can be less damaging to the hair, making them a popular choice for those seeking a long-lasting style without excessive heat exposure.