What is a function or artifact in an app that can be added in Design view of MIT App Inventor called?

In MIT App Inventor, the term used to describe functions or artifacts that can be added in the Design view is "Component." Components serve as the building blocks for creating applications, representing various elements such as buttons, labels, and images that users can interact with. They are visually arranged and configured in the Design view, allowing creators to define the user interface of the app.

Components are essential because they encapsulate both the visual representation and the behavior of items in the app. For example, a button component allows users to click it, triggering an action, and a label component displays text. Understanding components is crucial for effectively designing and manipulating the application's functionality.

The other terms listed do not accurately represent what is specifically used in MIT App Inventor for this purpose. "Element" and "Widget" could refer to various types of interactive objects in different programming contexts but are not the terminology used within MIT App Inventor itself. "Tool" is a more general term and does not specifically designate the interactive parts of the app.