cupcake or muffin?

who can tell me how to differentiate cupcake and muffin? 

tell you a secret, i bake that cupcake. and i wont tell you that i used ready mixed flour again, because it is pretty embarrassing and should not be proud of. 

By the way it is a vanilla flavour cupcake.

i added chocolate chips to satisfy my own craves!!

i only made one chocolate chips cupcakes, is only for siang! (tak cukup chocolate chips la)

*yummy*