usually when somebody wants to make a mobile application, he creates a control panel using any back-end (php, java, node.js …etc)
so he can control the API (if your app uses API call), he may also want to disable the application, so in each run in the application side, an API call will be invoked to check for availability.
you can do more complicated things but that is the basic
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solved What is app control panel [closed]