A laser printer works like a copier machine. Laser printers produce images on paper by directing a laser beam at a mirror which bounces the beam onto a drum. As the paper rolls by the drum, the toner is transferred to the paper printing the letters or other graphics on the paper. Laser printers use buffers that store an entire page at a time. When a whole page is loaded, it will be printed.
Laser printers are built to print large volumes quickly and at a low cost per page, while they operate quietly without producing much noise. Moreover, because the toner is already dry, you won't have to wait for it to dry and it won't smudge on your paper.