What is Two-Factor Authentication (2FA)?
A security method requiring two different types of verification to log in, like a password plus a phone code.
Why It Matters
2FA dramatically reduces the risk of account compromise because stolen passwords alone are not enough to log in.
Real-World Example
After entering your password, receiving a six-digit code on your phone that you must also enter.
“Understanding terms like Two-Factor Authentication (2FA) matters because it helps you have better conversations with developers and make smarter decisions about your software. You do not need to be technical. You just need to know enough to ask the right questions.”
Related Terms
MFA (Multi-Factor Authentication)
A security method requiring multiple forms of verification, such as something you know, have, and are.
Authentication
The process of verifying who someone is, usually through a username and password
SSO (Single Sign-On)
A system that lets users log in once and access multiple applications without signing in again.
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Related Terms
Authentication
The process of verifying who someone is, usually through a username and password
MFA (Multi-Factor Authentication)
A security method requiring multiple forms of verification, such as something you know, have, and are.
SSO (Single Sign-On)
A system that lets users log in once and access multiple applications without signing in again.
Authorisation
Determining what actions or data a verified user is allowed to access
OAuth
A standard that lets you log into apps using your existing accounts from Google, Facebook, or other providers
JWT (JSON Web Token)
A secure digital pass that proves who you are without needing to check the database every time