It refers to a plate-making technology in the printing industry, and it can also refer to the book typesetting style in publishing industries such as publishing houses.

1. In the printing industry, plate is one of the printing materials needed to make printed matter, usually made of metal, plastic or rubber. In the process of plate making, the images or characters to be printed need to be processed, converted, etched, deposited and coated with chemicals to form convex or concave patterns, then inverted on the layout, and then the plate is put into the printing machine for printing.

2. In the publishing industry, charts refer to the typesetting styles in books, magazines and other printed publications, including the typesetting design of various fonts, paragraph formats, chapter titles and so on. The design of plate is aimed at improving reading experience and visual effect, and at the same time, factors such as printing cost and printing efficiency need to be considered.