The Observer design pattern is mainly used in implementing distributed event-handling systems. What is the primary purpose of using it?

To create objects from a class hierarchy
To define a family of algorithms
To maintain a one-to-many dependency between objects
To provide an interface for creating objects

The primary purpose of the Observer design pattern is to maintain a one-to-many dependency between objects. This means when one object (the subject) changes its state, all its dependents (observers) are notified and updated automatically. It's commonly used in scenarios where you need to implement distributed event-handling systems or maintain consistent data across multiple objects.

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