Restoring a device to its factory settings erases all the data and settings on that specific device, effectively returning it to the state it was in when it was first purchased. This process removes all user-installed apps, settings, accounts, and personal data stored on the device.
However, it's important to note that this action only affects the individual device being restored. Other devices linked to the same Apple ID, such as iPhones, iPads, Macs, or other Apple devices, won't be affected by this reset.
Each device maintains its own independent data and settings, even if they are associated with the same Apple ID.
This separation allows for individual devices to be managed independently, allowing users to restore one device without impacting the data or settings on others using the same Apple ID.