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PostScript
Fonts = Consistent Control When the Macintosh desktop printing revolution started back in the mid-eighties, the major complaint from professional printers and typesetters was that the spacing of type was uneven and inconsistent from printer to printer. You couldn't blame them because they were right. Type set on a Macintosh just looked terrible compared to the finessed copy produced by an experienced typesetter. Adobe, now known for their graphics software like Photoshop and Illustrator, fixed this problem with the creation of something called PostScript. When one wants to print a document, PostScript technology takes the information and sends it to a printer in the form of simple text commands. A printer with a PostScript interpreter can then translate the text information into images and text. The output is consistent with what is seen on-screen and with any number of other printers. A designer could be sure that the output from their personal printer would be consistent with the output from a professional printer's imagesetter. It was also this technology that allowed fonts to be output
at a great variety of sizes without any decrease in quality. This is because
a font's outline file contains vector outlines of the font characters
which, like any vector art, can be
sized from the size of a postage stamp to the size of a house without
any loss in quality. Tip: Affordable Graphic Design classes are available near you? Sign up for FREE information from top design schools. Some Links You May Find Useful 
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ostScript
fonts require two computer files to work properly. The outline file and
the screen file. The screen file gives a computer system the information
to properly display the font, you guessed it, on-screen. The outline file
supplies the information that a printer (laser, inkjet, or a professional
printer's imagesetter) needs. 
