What is a page description font?

Generated by the outline of the mathematical formula, each Postscript font contains two parts, one part is a bitmap font, which provides a computer read display on the screen (usually jagged), and the other part is required Stroke fonts via mathematical operations are output by Postscript printers. If non-postscript printer output is used, then the fonts will behave like dot matrix fonts. The advantage of Postscript fonts is that they can be arbitrarily set at any size. The output is just as perfect.