App Updates - How to set to automatic

To ensure that Automatic Updates is enabled for Apps, do the following:
Select Settings -> iTunes & App Stores, and ensure Updates is toggled on (green)
 
Note that Automatic Updates will only occur if:
1) Your battery is at least 50% or your device is plugged in.
2) Your Internet connection is on WiFi connection.
3) Your phone is NOT in Low Power mode.