A survey of Linux PDF viewers
Portable Document Format, designed in the early 1990s by Adobe Systems, is slowly replacing PostScript as the preferred format for saving and viewing generic documents. Early on, only Adobe supplied programs that enabled users to view PDF files. But since the format's specification is open, Adobe Reader (formerly "Adobe Acrobat Reader") is now only one among an increasing set of PDF viewers. Here's a guide to the best alternatives for Linux users.
PDF's progenitor PostScript is a page description language that was invented in 1982, also by Adobe. It is an interpreted language with postfix (RPN) notation and is thus very flexible. In contrast, PDF is a file format describing the position and nature of text and pictorial content (in raster or vector format), which makes it easier to parse and process. To learn more about the relationship of PostScript and PDF, see Adobe's explanation.
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