Google Play Services Varies with device
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Powerful Google service that enhances your app experience ...Pre-installed on Android devices The app is now a critical part of the Android experience ... functionality of their apps. It can update Android settings without the need for an OS ...
- PROS: Allows for improved app experiences, Saves you updating the Android OS often, Avoids problems of fragmentation of the OS, Without it Google services won't work!
- CONS: Could drain your battery