What Is 2FA?
Two-Factor Authentication = Two locks instead of one
You need both your password AND your phone to log in. Even if hackers steal your password, they can't access your account without your device.
Think ATM: You need your card + PIN. 2FA works the same way.

Why Use It?
Without 2FA: Password stolen = Account stolen
With 2FA: Password stolen = Hacker still locked out
Over 24 billion passwords were leaked last year. Your password might already be compromised.

Three Types
📱 SMS Codes
Get a text with a 6-digit code → Type it in
Easiest but least secure
🔢 Authenticator Apps
Apps generate new codes every 30 seconds
Free, secure, works offline
Examples: Google Authenticator, Microsoft Authenticator
🔑 Security Keys
Physical USB device you plug in
Most secure but costs $25-50

How to Set It Up
Google/Gmail:
Settings → Security → 2-Step Verification → Get Started
Instagram:
Profile → Settings → Security → Two-Factor Authentication
Facebook:
Settings → Security and Login → Two-Factor Authentication
Most Apps:
Look for "Security" or "Privacy" in settings
Takes 2 minutes. Protects you forever.