Deleted app data still takes up storage space in iPhone 13

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When you offload an app on an iPhone or iPad, the app itself (its executable files and related components) is removed from your device to free up storage space. However, the app's data and documents remain stored on your device. This allows you to reinstall the app later without losing any of your personal information, preferences, or progress within the app.

Because the app's data is still present on the device, it continues to show up under Settings > General > iPhone Storage, where it is grouped together with the app's size. This ensures that the app can be restored seamlessly if needed. If you choose to delete the app instead of offloading it, both the app and its associated data are removed permanently, unless the data is backed up to iCloud or another location.