A font is a particular size, weight and style of a typeface.
There are thousands of type styles and many larger companies even brand there own style for logos and other promotional material.
It is quit easy to add font styles to your Windows computer. This video demonstrates how to search, download, install and use new fonts on your Windows computer.
Links as demonstrated in video:
http://www.1001freefonts.com
http://support.microsoft.com/kb/314960
Some common names used to describe the weight of a font:
Hairline
Thin
Ultra-light
Extra-light
Light
Book
Normal / regular / roman / plain
Medium
Demi-bold / semi-bold
Bold
Extra-bold / extra
Heavy
Black
Extra-black
Ultra-black / ultra
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