system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 How does laser tattoo removal work? How does light remove ink from the skin?
gpt
Tldr version is that it accelerates the process your body uses to fade them. 

The reason tattoos fade over time is that the particles of ink get recognized as foreign by the immune system and taken up by macrophages to be destroyed. This process stops or slows way down at a certain point because some of the ink particles are just too damn big. 

What the laser does is it zaps the pigments with a specific wavelength that they absorb, causing them to heat up very quickly and explode, breaking them into smaller pieces that the body's immune cells can process and get rid of.