The acronym PPD stands for 'PostScript Printer Description'. PPD files are used in the printing industry to provide detailed information and specifications about a particular printer model. PPD files contain instructions that help the computer and printer communicate effectively, ensuring accurate and consistent printing. They define various printer settings, such as paper sizes, resolutions, color spaces, and font handling. PPD files are commonly used in PostScript printers, enabling compatibility and efficient printing across different platforms and software applications.