PostScript means that the component on onscreen display and a printer component look the same. By using PostScript, a designer can ensure that what they see on the screen, as far as writing is concerned, will look exactly the same as it does when they have a hard copy.
TrueType fonts were designed as a collaboration between Apple Computer and Microsoft and consists of a single file whicch means that no separate screen and printer font components is not necessary.
Like TrueType fonts, OpenType fonts consist of a single file as well. The difference between True and Ope Type fonts is is that OpenType fonts are cross platform which means that the same font file can be used on a Mac or on a PC with no special handling.
Font families consists of groups of fonts that are the same style and they consist of the same characters. In font families the letters and characters are the same but they can consists of bold, italic, condensed, etc. types of strokes.
Glyphs consists of any distinct letterform that isn't normal. For example, numbers, lowercase p, or an ampersand are glyphs.
Multiple Master fonts generally begin with a PostScrpt font and then give the designer multiple choices including weights, angles and widths of the same font.
When licensing fonts, each style and character come with specific instructions about how they are supposed to appear. Because so much work goes into each and every font typeface by the creator, the licensing rules protect the fonts from being copied or stolen. Font licensing is a lot like copy right laws.
File naming should be simple and should make a file easier to find in a cluttered hard drive. Some computer types allow 225 characters in a name but generally under 30 is desired. The longer the name of a file is the more information your computer system has to attach to the file.
File extensions go in hand with file naming. When a designer uses a file extension, they make it much easier for humans to recognize the individual files and are crucial for cross-platform compatibility. When using a Mac and PC computer you can hide the extensions but they are still there.
Multiple types of formats can cross platforms if the technology on both devices is updated. EPS, BMP, PCT, GIF, JPG, TIF, PNG, and PDF can all cross platforms.
Sources:
http://en.wikipedia.org/wiki/Font_style#Font_style
McCue, C. Print Production with Adobe Creative Suite Applications.2009, Peachpit
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