Enumeration interface is a read-only interface. It has better performance than Iterator. It is almost twice as fast as compared to an Iterator. It also uses very less memory. Also Enumeration does not have remove() method.

On the other hand, Iterator interface is safer than Enumeration, since it can check whether a collection is modified or not during iteration. If a collection is altered while an Iterator is iterating, then it throws ConcurrentModificationException.