UIViewController

A UIViewController is a core component in iOS app development that manages a single screen or interface within an app. It controls how the content is displayed, handles user interactions, and coordinates updates to the view. Think of it as the manager of a specific part of the app's user experience, ensuring everything works together smoothly. When you navigate through different parts of an app, each screen typically has its own UIViewController to handle its unique functions and visuals. It helps developers organize and modularize the app’s interface, making it easier to build and maintain.