Page Description Language (PDL) is a computer language used to describe the layout and appearance of printed pages. It allows designers and printers to specify how text, images, and graphics should be arranged on a page, ensuring consistent output across different devices. Common examples of PDLs include PostScript and PDF. These languages enable the creation of high-quality documents by defining elements in a way that can be interpreted by printers and other output devices, making them essential in the publishing and printing industries.