Serif, Sans, and Mono

Do you know which is which?

sans serif



serif



mono



Ligatures

Oftentimes you want to combine letters together in a special way if they might accidently overlap when put next to each other—thus, the idea of ligatures.

http://upload.wikimedia.org/wikipedia/commons/f/f3/Ligature_drawing.svg

Sometimes these ligatures can become quite complex...

http://upload.wikimedia.org/wikipedia/commons/6/6b/Caslon_Pro_Ligatures.svg