Android package name is a unique identifier for your application. It's usually written in reverse-domain style (e.g. applications published by Innov8tif start with com.innov8tif). In most cases, it's defined in the Android manifest file of your Android app.

Bundle ID is a unique identifier for your iOS application. It's usually written in reverse-domain style (e.g. applications published by Innov8tif start with com.innov8tif). In most cases, it's defined in your application's Info.plist file, under "bundle identifier", or in Xcode, under your target’s General > Identity section.