Could you explain what is meant by behavioral design patterns?

Behavioral design patterns describe ways objects interact and responsibilities are distributed among them. They help organize communication and manage system behavior, making the code more flexible and maintainable.

Examples of behavioral patterns:

• Observer — allows objects to subscribe to events of another object and receive notifications about changes.
• Strategy — defines a family of algorithms, encapsulates each one, and makes them interchangeable.
• Command — encapsulates a request as an object, allowing parameterization of clients with different requests.

In iOS, the Observer pattern is often used via NotificationCenter or delegates to pass events between objects.