Can you explain what UIKit is and what it is used for in iOS development?

UIKit is a framework from Apple that provides a set of classes and tools for creating user interfaces in iOS applications. It is responsible for displaying interface elements, handling events, animations, and user interaction.

With UIKit, you can create windows, buttons, tables, text fields, and other visual components, as well as manage navigation between screens.

An example of using UIKit is creating a button and adding it to the screen:

let button = UIButton(type: .system)
button.setTitle("Press me", for: .normal)
button.frame = CGRect(x: 50, y: 100, width: 150, height: 50)
view.addSubview(button)

Thus, UIKit is the main tool for building interfaces in iOS.