Here’s a focusing on Google Play Services APK for Android 4.4.2 (KitKat, API level 19) . These features are based on the last supported version of Play Services for KitKat (around v21.x.x or earlier, since newer versions require higher API levels).

Google Play Services is not a standalone app but a background "bridge" that connects your device to Google’s ecosystem. On a 4.4.2 device, it provides: