How it Works - Static Electricity
While the term "inkjet" pretty effectively describes the technology inside the machine (little nozzles shooting ink very quickly), the term " laser printer" is a bit more elusive. How, exactly, does a focused beam of light inscribe information on a piece of paper? I'm sure you can guess that it isn't by burning an image into it, but let's go into how exactly this technology works.
The principle behind laser printing is actually static electricity. Static electricity is the same stuff that makes your clothes cling, shocks you when you touch your car door handle, and also what causes lightening bolts. In scientific terms, since oppositely charged atoms are attracted to each other, you can oppositely charge objects to make them cling.
The first step of printing on a laser printer is the photoreceptive drum (a rotating cylinder) is given a positive charge across its whole surface. From there, the laser unit will essentially draw the image onto the roller by discharging certain points. After the image has been invisibly inscribed on the drum, the printer coats the drum in a positively charged toner. Laser printer toner is a very fine black powder - not ink at all. Since the inscribed area has a negative charge, the toner will cling to it. Since the rest of the drum, the "background", so to speak, has a positive charge, it rejects the toner. After that, the drum rolls across a heavily negative charged piece of paper, pulling the toner onto it.