The Iterable interface can be defined as the common behavior of all classes in the collection framework that supports a mechanism to iterate through all the elements of a collection. It is an object that uses an Iterator interface to iterate over all the elements in a collection. There are two abstract classes, IterableBase and IterableMixin, that implement the Iterator interface. The IterableMixin class is perfectly suited to be extended in the mixin solutions. If you plan to create your own implementation of the Iterable interface, you need to extend one of them. There are many different methods in the Iterable interface to help you manipulate the elements in a collection.