A wireframe for an app is a basic visual representation or blueprint that outlines the layout, structure, and functionality of the application's screens and user interface. It serves as a skeletal framework to demonstrate the arrangement of various elements and interactions without including detailed design elements such as colors, graphics, or typography.

UI (User Interface) design and UX (User Experience) design are two closely related disciplines that focus on different aspects of the overall user interaction within an app or system. UI design focuses on the visual and interactive aspects of the interface, UX design focuses on the overall user experience and satisfaction, with both disciplines working together to create products that are both visually appealing and user-friendly.

Prototypes often incorporate interactive elements such as clickable buttons, links, menus, and form fields to simulate the user experience and demonstrate how the product will behave in real-world scenarios. This allows users to interact with the prototype in a meaningful way and provides valuable feedback.