If you do not know laser marking machine, I think the best way is show you the video

Laser marking machine has two kind of types,fiber laser marking machine and co2 laser marking machine.
Fiber laser marking machine used for metal and Some hard plastic.
Co2 laser marking machine used for non-metal laser marking machine such as wood,leather,acrylic,Silica gel
Now,let us watch the video

Fiber laser marking machine

CO2 laser marking machine