IPL stands for intense pulsed light and uses a source of broad-spectrum visible light. There are different wavelenghts which targets specific structures. So for hair removal it targets melanin in hair follicle, for spider viens it targets haemoglobin.
It also helps in reducing acne by killing the bacteria. Also helps in skin rejuvenation, reduces fine wrinkles hence used in photofacial.
For hair removal We get best results in fine and light coloured hair with IPL. It is not suitable for darker skintone.