Type weight influences the way faces appear. Regular is the average weight class, simple and unadorned. Bold is heavier and slightly wider than regular typeface and is used to emphasize text. Light typeface is slender, and as its name implies, lighter than regular typeface. It also has a subtler impact than regular or bold forms and can help achieve a minimalistic look.
Typefaces can have a variety of widths.
The two most common type widths, which are somewhat self explanatory, are condensed and expanded. A condensed, or compressed, form has a tighter letterform width than the standard version, and an expanded, or extended, typeface is wider than the standard version. She hated the way I slouched. Of course, I thought I looked cool. Posture conveys a great deal, making a word, phrase or heading seem active or static, serious or whimsical.