The Common UNIX Printing System (CUPS) is software that allows a computer to act as a print server, receiving print jobs from client computers, managing them, and sending them to the appropriate printer. It consists of a print spooler and scheduler, filters to convert print jobs to the format required by each printer, and a backend system to send the data to the chosen printer from client applications. Since every printer manufacturer does things differently, printing can be very complicated, and has always been a hard issue in the UNIX world for this reason. By providing a portable, modular...