In MIT App Inventor, what is a control block that looks for inputs or events?

In MIT App Inventor, an event handler is a specific type of control block designed to respond to inputs or events triggered by user interactions or other occurrences within the app. The primary role of an event handler is to define what action should take place when a particular event occurs, such as a button being clicked, a screen being opened, or any other user-defined interaction.

Event handlers are essential for making apps interactive and responsive to user actions, enabling developers to create dynamic applications that react accordingly to various stimuli. This capability distinguishes event handlers from other blocks that may deal with inputs or data without responding to events directly.

In contrast, some of the other terms might imply control over actions or inputs but do not specifically refer to a mechanism for handling events. For example, a listener generally points to a more fundamental concept of monitoring for events, while a trigger usually indicates a specific condition that starts an action rather than defining how to respond to that action.

Thus, event handlers serve as the building blocks for interactivity in App Inventor, allowing developers to create engaging applications effectively.