A customer wants to display a small toolbar with three icons - a " sad...

In Appian, interfaces are used to design and render user interface elements, allowing for the creation of custom layouts and components that can interact with users. In this scenario, the toolbar with emotion icons is a UI element that needs to be consistently presented across various pages. Using an interface ensures that these icons can be interactively used by users to express their sentiments, and the data collected can be analyzed for user experience insights. Interfaces are capable of embedding such UI elements and can be invoked or included across multiple pages within an application, making them the ideal choice for this requirement.