Dialog Boxes are pre-built popups in the Run Native App designed to handle common tasks in your flow, such as applying discounts, adjusting product inventory, adding a customer, etc. They’re connected to specific actions created in Builder: when one of these actions is triggered during a flow, the corresponding dialog box automatically appears in the Run Native App. There's no need to design a custom popup for these tasks in Build, since the system will automatically use these built-in dialog boxes when needed.