The people who create apps and games for Windows Phone are constantly making tweaks and improvements, fixing bugs, or adding new features. When a newer version of an app you've downloaded becomes available, the update will be downloaded and installed automatically by default.
By default, app updates will only be installed over Wi-Fi
. If you're not on Wi-Fi when an update becomes available, the update will be added to your downloads queue and will download automatically the next time your phone connects to a Wi-Fi network.
If you have an app update in your downloads queue, and it's less than 50 MB, you can choose to download it immediately over your cellular data network
This tutorial will show you how to turn on or off automatic app updates
, and turn on or off to only get updates over Wi-Fi
in Windows Phone 8.1