Digital perm
A perm using heated rods controlled by a machine, giving soft, loose curls, popular in East Asia.
Also: hot perm, setting perm
A digital perm, developed in Japan and widely used in South Korea and Japan, is a heated perm. The hair is treated, then wound onto rods connected to a machine that controls their temperature. It gives soft, bouncy curls that look most defined when dry, unlike a cold perm, whose curl shows best when wet. It suits medium and long straight hair. The Korean 'C-curl' and 'S-curl' perms are common versions.