Apple’s App Store and Google’s Play Store both offer a feature called “app store expiration.” If an app is not used for a certain period of time, it is automatically deleted from the app store and from Google Play. If you do not have an App Store account, you can create one by signing in to your Apple or Google account. If your app’s expiration date comes up, it might be because you haven’t used it in a while or because you’ve been using another app that has expired. If you’re not sure, check the App Store and Google Play Stores websites to see if your app has been deleted or if it’s just about to expire.