NDYAG (neodymium-doped yttrium aluminum garnet) laser and diode laser are both types of lasers that are used for hair removal and other cosmetic procedures. There are several differences between NDYAG laser and diode laser:

1. Wavelength: NDYAG laser uses a wavelength of 1064 nanometers, while diode laser uses a wavelength of 810-830 nanometers. The wavelength of the laser determines how deeply it can penetrate the skin and how effectively it can target the hair follicles.

2. Skin type: NDYAG laser is generally considered safer and more effective for people with darker skin tones, as it is less likely to cause pigmentation changes. Diode laser may be more effective for people with lighter skin tones.

3. Hair type: NDYAG laser is more effective at targeting and destroying thick, coarse hair, while diode laser is better at removing finer, lighter-colored hair.

4. Pain: NDYAG laser may be more painful than diode laser, as it delivers more energy to the skin.

It is important to note that both NDYAG laser and diode laser are medical procedures and carry potential risks and side effects. It is always best to discuss the potential risks and benefits of these procedures with a healthcare provider before undergoing treatment.