IPL stands for intense pulsed light, and it is a form of light therapy, used for various dermatological procedures including hair removal. Unlike laser treatments, which have just one specific wavelength emitted from the diode depending on what you're targeting, IPL has multiple wavelengths (all between 500 and 1,200 nanometres) that scatter within the skin.As with all light based treatments, IPL works by emitting a wavelength into the skin, which in the case of hair removal targets pigment. "It works in the same way black clothing absorbs heat on a hot day, versus white clothing which reflects it. The light is absorbed by the pigment in the hair. It quickly turns to heat which then kills the growing cells that make the hair. IPL works like a flash-lamp, sending out scattered wavelengths of light, making IPL very targeted. That also means it affects the pigment in your skin too, so IPL only really works for those with fair skin and dark hair.