The Xerox Phaser 3450 PS is a monochrome laser printer, and the "PS" in the name refers to PostScript, a page description language used for defining how a printed page should appear. The printer uses PostScript for high-quality, precise printing, especially useful in environments that require accurate rendering of graphics and text.

The Windows driver for the Xerox Phaser 3450 PS allows your computer to communicate with the printer and control its functions. The driver converts the data from your computer (whether it's a Word document, an image, or a PDF) into a format that the printer can understand and print.