What is UIKit?

UIKit is a framework provided by Apple for building graphical, event-driven applications for iOS, iPadOS, tvOS, watchOS, and visionOS. It provides the fundamental classes and protocols needed to construct user interfaces, manage user interactions, and handle app lifecycle events. UIKit is commonly used for creating the visual elements of an app (buttons, labels, text fields, etc.), managing the layout of these elements, handling user input (touches, gestures), and displaying information to the user.