A unique string that identifies a single iOS application within the Apple ecosystem, following a reverse domain name convention. For example, `com.example.myapp` represents an application developed by ‘example’ called ‘myapp’. This identifier is fundamental for distinguishing the application from all others available.
This string plays a critical role in various processes, including application distribution through the App Store, enabling push notifications, managing application entitlements, and facilitating inter-application communication. Its immutability is essential; once established for an application, it should remain consistent throughout its lifecycle, as changes necessitate creating a new application entry in the App Store.
