When you enable iCloud for an app, its data is securely stored in iCloud and updated across your devices automatically. When you turn off iCloud, the app will no longer be connected to it, so your data will just be on your device.
To remove your Apple ID, go to https://appleid.icloud.com manage. You can also delete your account; however, it will require you to delete your entire Apple ID as well. If you lose access to your Apple ID, you’ll no longer be able to use various services like the App Store and iTunes purchases
Tap your name in the Settings app to open it. to use iCloud, you need to first create an Apple ID for yourself or someone else who is using your Mac. To set up this feature, follow these steps.
On a computer: Sign in to iCloud and scroll down to Devices. Select a device and press Remove Account. Online, sign in to iCloud Manage Account Delete Your Account Request To Apple provides you the option of selecting one of four reasons for agreeing to the terms (or any other reason that you can think of). Then provide them with your new email.
The Photostream, as well as the images in the stream folder, are removed from the device if you disable iCloud Photostream on it. iCloud photo stream will not be influenced by any other devices using it. It may also be removed from the photo stream just like any other folder.
