When I get a notification about an app update I often wonder what changed in this update. Is there a quick & easy way to find out? (No typing.)
Note: This is with auto-update enabled, when the update is already installed.
If you want to know the changes made in the app after the update then simply follow this steps.
Notice that you cannot do this if auto-update is enabled. You must open the Play Store, tap Menu (three dots in upper right of screen), and select My Apps. From there, do step 3.
Take note that not all developers post their changes in the market. For that you will need to google for the answer.