App-specific passwords are passwords for your Apple ID that let you sign in to your account and securely access the information you store in iCloud from a third-party app. For example, use app-specific passwords with mail, contacts, and calendar services not provided by Apple. App-specific passwords maintain a high level of security and help ensure your Apple ID password won’t be collected or stored by any third-party apps you use.
If you are signed in to iCloud for Windows, you don't need an app-specific password when using your Apple ID with third-party Microsoft apps.
To generate and use app-specific passwords, your Apple ID must be protected with two-factor authentication.
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You also need an app-specific password for your devices that use Mac OS X Lion 10.7.5 and earlier or iOS 5 and earlier. If you don’t have devices that can be updated to iOS 9 or later or OS X El Capitan or later, you can set up two-step verification and generate app-specific passwords.
How to generate an app-specific password
Sign in to your Apple ID account page.
In the Security section, click Generate Password below App-Specific Passwords.
Follow the steps on your screen.
After you generate your app-specific password, enter or paste it into the password field of the app as you would normally.
How to manage app-specific passwords
At any given time, you can have up to 25 active app-specific passwords. If you need to, you can revoke passwords individually or all at once.
Sign in to your Apple ID account page.
In the Security section, click Edit.
In the App Specific Passwords section, click View History.
Click next to a password you want to delete, or Revoke All.
Single Unit Mac App Installer
After you revoke a password, the app using that password will be signed out of your account until you generate a new password and sign in again.
Single Unit Mac App Windows 10
Any time you change or reset your primary Apple ID password, all of your app-specific passwords are revoked automatically to protect the security of your account. You'll need to generate new app-specific passwords for any apps that you want to continue using.