There are two most popular methods — digital and offset printing.
What is offset printing?
There is a reason why offset printing is called what it is. It is because the ink for the image is transferred to a cylinder before being applied to the print surface, rather than directly. The process calls for plates made of aluminum or some similar material.
What is digital printing?
This type of printing involves an image being digitally transferred from the computer to a digital printing machine. Electrostatic rollers, also known as drums, are used to apply toners to sheets of paper — a process similar to that used by most inkjet printers. Plus, for each color applied, a different drum is required.