jQuery deferreds and promises - .then() vs .done()

Question

I\'ve been reading about jQuery deferreds and promises and I can\'t see the difference between using .then() & .done() for successful callbacks

Answer 1

.done() has only one callback and it is the success callback

.then() has both success and fail callbacks

.fail() has only one fail callback

so it is up to you what you must do... do you care if it succeeds or if it fails?