The bundle identifier is the unique string that identifies your application to the system. This compares to the display name (namespaces are usually prefixes in frameworks), which is what iOS uses to show the name of your app on the springboard.
Bundle identifiers are usually (not always) written out in reverse DNS notation (I.e com.myCompany.myApp).
Your bundle ID must be registered with Apple and be unique to your app.
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Bundle identifiers are usually (not always) written out in reverse DNS notation (I.e com.myCompany.myApp).
Your bundle ID must be registered with Apple and be unique to your app.