Are you the type who sits around and tries to figure out how things work? Did you ever get in trouble for taking apart the toaster or the TV remote when you were little, building huge towers of legos and kinects and trying to makes sense of how the world works? Well it is time to grow up—not to say that you should stop investigating, but that you should do it in a more efficient and, frankly, more informed way. How stuff works is a great website containing schematics and information on how just about everything works. Including how a Laser Printer functions.
Laser printers are usually used in schools or offices where there is a lot of continuous printing going on most of the day. They run hot and fast and are more efficient than inkjet printers, using supplies of toner powder rather than a reservoir of liquid ink. To understand how these manage to use a laser to spit out dozens of sheets of paper and letters a minute, we need to understand static electricity.
When things are charged either positively or negatively they attract each other. This information is better and more fully explained in the article above but a laser writes a negative image on a revolving positive drum. This negative image (your text or picture) draws the positively charged toner particles to it. When this drum then roles over your paper the ink is pulled by a stronger positive charge down onto the paper.
Then the paper passes through a hot fuser and the ink is melted and fixed onto your document! Of course, there are other little steps and control systems. But in basic, this is how your printer works—and if you are one of those fascinated souls, how stuff works can tell you even more about the process!