What structure is commonly used to define event handlers in applications?

The event model is a critical concept in programming that outlines how events are detected, managed, and handled within an application. It provides a framework for defining the relationships between events, event sources, and the corresponding actions taken when an event occurs.

In the event model, components within an application can generate events, and these events can be observed by event listeners, which are typically defined using the structure of the event model. This model helps developers establish how specific actions (like clicks, key presses, etc.) can trigger responses in the application, making it easier to manage user interactions in a coherent way.

While event listeners and event handlers are important parts of the overall process—event listeners listen for specific events, and event handlers are the functions or methods that run in response to those events—the event model itself encompasses broader principles, including the way in which events are structured and how they cascade through an application. This overarching framework is essential for building responsive and interactive software applications.