The Google Play Service Library contains APIs that provide an interface to the individual Google services. This interface also allows you to obtain authorization from users to gain access to these services using the users' credentials. These services include Google Drive, Play Games and more. Since the library derives updates from Google Play, it does contain APIs that help you resolve any issues at runtime. Sometimes you may have come across apps that prompt you to update Google Play Services before proceeding. The Google Play Service APK runs as a background service in the Android OS and you can interact with the background service though the client library. The service performs the desired action on your behalf.
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