IPL (Intense Pulsed Light) is a modern type of laser hair removal used for permanent/long-term hair removal.
Broad-spectrum light is applied to the surface of the skin, targeting melanin. This light travels through the skin until it strikes the hair follicle. The follicle is usually where the highest concentration of melanin is located. As the light is absorbed, the bulb and most of the hair shaft are heated, destroying the hair-producing papilla.