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An event interface is a programming construct that defines a set of methods representing events. In essence, it acts as a contract for how objects can signal that something has happened. When an object implements an event interface, it agrees to provide the specified methods that can be invoked by other parts of the system when those events occur. This allows for a decoupled and flexible design, where different components can react to events without needing direct knowledge of the event's source.

The primary purpose of an event interface is to facilitate communication between different parts of a software application. One component might trigger an event, and other components that have registered their interest in that event can then be notified and execute their corresponding actions. This pattern is particularly useful in user interface development, where user interactions like button clicks or mouse movements are represented as events. However, event interfaces are also widely used in network programming, data processing, and any scenario where asynchronous communication or reaction to external stimuli is required.

By using event interfaces, developers can create systems that are more modular and easier to maintain. New event handlers can be added or removed without altering the core logic of the event-generating component. This promotes reusability and allows for the creation of complex behaviors through the composition of simpler, event-driven modules. The implementation details of how an event is triggered and how it is handled are separated, leading to cleaner and more understandable code.