What’s the Difference between PDF and PostScript
Before Adobe’s founders got rich and famous they had worked for Xerox at the Palo Alto Research Centre. John Warnock and Chuck Geschke were up to their ears in page description languages, which are programming languages that describe page content above and beyond the basic bitmap. According to John Warnock, PostScript was designed to be a modern standard for electronic printing, and indeed that is precisely what it became.