What are the differences between an alternator and a generator?

Alternator and generator, both devices have the same basic functionality. They both convert mechanical energy into electrical energy and they both have the same principal of electromagnetic induction. The main and only difference between these two devices lies in the construction. Alternator has a stationary armature and a rotating magnetic field for high voltages, while generator uses stationary magnetic field and rotating conductor which rolls on the armature with slip rings.