About the digital perm: A digital perm is a perm that uses hot rods with the temperature regulated by a machine with a digital display, hence the name. The process is otherwise similar to that of a traditional perm. The name "digital perm", Hairstylists usually call it a " hot perm". 

A normal perm basically requires only the perm solution. A digital perm requires a (different) solution plus heat, about 2 hour to complete, result usually lasts about 6 months. This type of perm is popular in several countries, including South Korea, China and Japan.