Typography / Calligraphy

The difference between the two is basically, that Calligraphy's mission is purely decorative. The usage of letters is essential to any application, from web to fashion, since writing is the main form of communication, and everyone has to deliver a message. Decorative letters are so much more appealing that a simple font display, but also, the choice of the right font conditions the message we are reading by giving a kind of mood to it. Don't we all think Comic Sans is funny, and Helvetica is neutral?