The latest national standard GB / T9851.1-2008 defines printing as: "the process of copying colorants / colorants (such as inks) onto substrates using analog or digital image carriers."

meaning:

In the literal sense, there are marks of traces, brushes of rubbing. Rubbing with a brush to leave marks on other objects is called printing. In short, printing is the industry that produces printed matter. The production of printed matter is similar to the seal.

The seal (plate) is engraved first, and then the seal (plate) is dipped in ink, and then the ink on the seal (plate) is transferred to a substrate such as paper, paper, leather, etc., and it becomes a printed matter. Computer-printed documents can be printed by laser printers, inkjet printers, or other computer printers. In recent years, computer printing and industrial printing processes have merged, leading to the development of digital printing.