Duplex printing is a process in which a printer is used to print on both sides of a sheet of paper. This can be accomplished either automatically or manually by flipping the paper over and printing on the other side. Duplex printing conserves paper usage and reduces printing costs as well as environmental pollution. Many modern printers come with automatic duplex printing capabilities, which allow for quicker and more efficient printing. Duplex printing is commonly used in offices, schools and homes where large amounts of printing are done. This is an efficient way to save time and resources.