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• Two-factor authentication for Apple ID
  • “Two-factor authentication is an extra layer of security for your Apple ID designed to ensure that you're the only person who can access your account, even if someone knows your password.” Fair Use Source: https://support.apple.com/en-us/HT204915

Research:

• two-factor authentication on Wiktionary
• two-factor authentication on DuckDuckGo
• two-factor authentication on O'Reilly
• two-factor authentication on GitHub
• two-factor authentication on Reddit
• two-factor authentication on StackOverflow
• two-factor authentication on YouTube

Fair Use Sources:

• two-factor authentication on DuckDuckGo