What types of data and settings will be saved in the application after its reinstallation?

After reinstalling an iOS app, data stored outside its container is preserved, such as:

• Data in iCloud (if the app uses iCloud for synchronization)
• Keys and passwords stored in Keychain, which are saved by default between installations

All data stored in the app's local storage (UserDefaults, files in Documents, Core Data) will be deleted when the app is removed. Therefore, to preserve important settings and data between installations, it is recommended to use Keychain or iCloud.