We use iterators in software projects all the time. When we traverse a list or go through the items of a set or a map, we use an iterator.
The iterator design pattern provides a way to access the elements of an aggregate object (collection) in a sequential manner without exposing the underlying representation of the items.
When using the iterator design pattern, the developer doesn't need to know whether there is a linked list, array, tree, or a hash map underneath.
