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title: Events
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# Events

Event-driven programming is used in many languages and frameworks, such as JavaScript and Java Swing. The idea is that you write handlers that respond to interface events as they occur.

A component registers that it may fire an event in its markup. Events are fired from JavaScript controller actions that are typically triggered by a user interacting with the user interface.

There are two types of events in the framework:

-   **Component events** are handled by the component itself or a component that instantiates or contains the component.
-   **Application events** are handled by all components that are listening to the event. These events are essentially a traditional publish-subscribe model.

You write the handlers in JavaScript controller actions.

**See Also**  


-   [Communicating with Events](https://developer.salesforce.com/docs/platform/aura-platform/events/events-intro.md)
-   [Handling Events with Client-Side Controllers](https://developer.salesforce.com/docs/platform/aura-platform/js/js-client-side-controller.md)