What is the difference between the app ID and the bundle ID? Where is the app ID in the Xcode project?

Question

In the pList file, there is a bundle ID of the form com.mycompany.myapp, but Apple also provides an app ID on the developer portal.

Thus, basically, what is the use

Answer 1

Multiple apps can share the same App ID. The App ID does not uniquely identify an application.

An App ID is a two-part string used to identify one or more apps from a single development team

https://developer.apple.com/library/content/documentation/General/Conceptual/DevPedia-CocoaCore/AppID.html

The ID that you see in iTunes Connect, which is unique across apps, is known as the application's Apple ID. I apologize for the confusion because no one at Apple will.