Passwords and Authentication
A password is a secret piece of text used to prove you are who you say you are before a system lets you in, and a strong password is typically long, unpredictable, and not reused across different accounts. Many services now also offer two-factor authentication, which requires a second, different kind of proof beyond your password, like a one-time code sent to your phone, that helps protect an account even if someone else learns your password.
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