What does the Expression widget do?

The Expression widget is designed to display text that is calculated at runtime, which makes it particularly powerful for dynamic web applications. This means that it can take into account variable data, such as user inputs, database results, or other runtime conditions, and generate a result that can be presented to the user as part of the web interface.

For example, if you want to show a greeting that incorporates a user's name or some calculated value, the Expression widget can evaluate that at the moment the page is rendered and display the appropriate text. This capability allows for a more interactive and personalized user experience.

In contrast, the other options focus on static presentations or specific types of media. The first option implies that the widget displays only unchanging text, which does not leverage the robust functionality of the Expression widget. Similarly, displaying only mathematical expressions is too narrow a definition, as the widget can handle a wider range of dynamic content beyond just numbers. Lastly, the inability of the widget to display images and videos further differentiates its primary use from those media types, which would typically require a different widget designed specifically for media display in OutSystems.