Difference between SceneDelegate and AppDelegate

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The two files are meant to split the work by what is needed to run the app as a whole and what is needed for one “instance” that would support visibly running in the background. This would be something like configuring a database once, but displaying different sets of values by window.

You could think of them as the global and private versions. One is shared and the other is limited to the individual owner. In a way, they are exactly what you would expect by the names.

Multi-window support is happening

Next time you create a new Xcode project you’ll see your AppDelegate
has split in two: AppDelegate.swift and SceneDelegate.swift. This is a
result of the new multi-window support that landed with iPadOS, and
effectively splits the work of the app delegate in two.

From iOS 13 onwards, your app delegate should:

  1. Set up any data that you need for the duration of the app.
  2. Respond to any events that focus on the app, such as a file being shared with you.
  3. Register for external services, such as push notifications.
  4. Configure your initial scenes.

In contrast, scene delegates are there to handle one instance of your
app’s user interface. So, if the user has created two windows showing
your app, you have two scenes, both backed by the same app delegate.

Keep in mind that these scenes are designed to work independently from
each other. So, your application no longer moves to the background,
but instead individual scenes do – the user might move one to the
background while keeping another open.

Courtesy of https://www.hackingwithswift.com/articles/193/whats-new-in-ios-13

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