Actually this feature with default enable to update automatically in the background, with this feature no need to check and upgrade the software or applications since 2007. If you wants to turn off this feature auto app updates then simply follow this guide which provides the following below steps
- Launch the settings application and tap on the iTunes and App Store.
- Once you open the iTunes and App Store, under the untitled Automatic downloads you will see the options like music, applications, books and updates many more.
- Now tap on the toggle switch to turn it off that means disabling this feature.
By default this feature will be enabled since iOS 7, you can choose whether you need automatic updates when using a data connection or not. Just by flicking the use cellular data flip on the will permit to download updates over a data connection. Turning the feature off will download upgrades when the customer or user connected to WiFi Network.