What's the difference between a sultana and a raisin?

Becoming a sultana is every dried fruit's currant raisin d'ȇtre.

This week's Resolution Recipe: German Crown Prince's Apple Cake.
"This delicious pudding closely resembles a modern American-style cheesecake, but retains the fruity sharpness of juicy apples."
( Which German Crown Prince? Dunno. )