Anatomy of Type

ANATOMY OF TYPOGRAPHY

Typefaces are finely designed pieces. They communicate on several levels. Typographers (search Wikipedia for a definition) spend a lot of time and effort finessing their creations. Like any construction that follows standards, typefaces have terminology that helps in communicating to other typographers and designers the issues related to type.

References: 

http://en.wikipedia.org/wiki/Letter-spacing

http://www.fontshop.com/

http://en.wikipedia.org/wiki/Leading