When you talk about how much you like a tune, you don’t say: “That’s a great MP3”. You say: “That’s a great song”. The MP3 is the delivery mechanism, not the creative work; just as in type a font is the delivery mechanism and a typeface is the creative work.

Stephen Coles, typography enthusiast and contributor to Font Feed, on the distinction between the terms "font" and "typeface." (via Jeff Croft.) (#)