what is correct format of bundle identifier in iOS?

2 Solutions Collect From Internet About “what is correct format of bundle identifier in iOS?”

All the formats which you have mentioned are correct. But the standard format as expected by apple is com.company.appname.

The First type is the correct one.It is a standard to use the reverse domain name as the bundle identifier along with app name.
For example com.google.gmail,com.fb.messanger