In which scenario is refreshing data necessary?

Refreshing data is necessary primarily during an Ajax Refresh scenario because this action allows you to update parts of the user interface without reloading the entire page. By executing Ajax Refresh, you can pull the most current data from the server and display it to the user, ensuring that they see real-time updates without disrupting their experience. This is particularly important in applications where data can change frequently due to user actions or other events, so integrating Ajax Refresh effectively enhances the responsiveness and interactivity of the application.

When loading a new screen involves a different interaction model; it typically fetches all the necessary data upfront as the screen is loaded, rather than updating existing data in context. Starting a new action doesn’t inherently require refreshing existing data since this process often relies on the current context. Similarly, while changing user settings may impact subsequent data, it doesn't automatically necessitate a refresh unless those settings specifically affect displayed data during the current session.