If you have heard of something called Dermaroller then you likely would have heard of Micro-needling. Dermaroller is just the more common name for it. If you haven't, and you are unsure what it is exactly, it's a process by which a roller or stamp-like tool covered in tiny needles is used to poke many holes into the skin. The holes are so small that they are barely visible, but collectively they are meant to improve skin health.
Dermarollers are quite different from cosmetic-lasers that use lasers to treat the skin. While lasers use a combination of a certain light frequency and heat, Dermarollers and other micro-needling tools like Dermastamps treat the skin with needles.