I have a friend that arbitrarily uses extended and condensed fonts all the time.
What is the difference between condensed and compressed? Are there rules to when and where to use these versions of a font? I don't believe I've ever had the inclination to use these versions, but when I see my friend's work I know it's out of place. I can't really make a good argument for or against his use of these styles.
Can someone enlighten me?