PostScript is an object-oriented language, meaning that it treats images, including fonts, as collections of geometrical objects rather than as bit maps. PostScript fonts are called outline fonts because the outline of each character is defined. They are also called scalable fonts because their size can be changed with PostScript commands. Given a single typeface definition, a PostScript printer can thus produce a multitude of fonts. In contrast, many non-PostScript printers represent fonts with bit maps. To print a bit-mapped typeface with different sizes, these printers require a complete set of bit maps for each size. ??There are three basic versions of PostScript: Level 1, Level 2 and PostScript 3. Level 2 PostScript has better support for color printing. PostScript 3 supports more fonts, better graphics handling, and includes several features to speed up PostScript printing.