Dye-sublimation printing allow you to print photo-lab-quality pictures.
Sublimation is when a substance transitions between the solid and gas states without going through a liquid stage; the action of dry ice exposed to room temperature is a common example. In a dye-sublimation printer the printing dye is heated up until it turns into a gas, at which point it diffuses onto the printing media and solidifies. So dye sublimation printing has other name is heat transfer printing.