Explain the Iterator design pattern.

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Explain the Iterator design pattern.

The Iterator design pattern is a behavioral design pattern that provides a way to access the elements of an aggregate object sequentially without exposing its underlying representation. It allows clients to traverse through the elements of a collection in a consistent manner, regardless of the specific implementation of the collection. The Iterator pattern decouples the client code from the internal structure of the collection, making it easier to modify or replace the collection implementation without affecting the client code. It also promotes the principle of single responsibility by separating the iteration logic from the collection itself.