Skip to content
Know.itKnow.it
Create an animated lesson
On request

This article is free to read. Creating a lesson uses your daily or stored credits; review the language and settings before starting.

How does two-factor authentication work?

TechnologyLesson on requestFree to read

Quick answer

Two-factor authentication (2FA) adds a second check beyond your password. After entering your password (something you know), you confirm a second factor — like a code from your phone (something you have) — so a stolen password alone isn't enough to get in.

Step by step

  1. It requires two separate proofs of identity.
  2. Typically a password plus a phone code or app prompt.
  3. A stolen password alone won't grant access.
  4. It dramatically improves account security.

People also ask

How does two-factor authentication work?
You confirm your identity with two things — your password plus a second factor like a phone code.
Why is 2FA more secure?
Even if someone steals your password, they still need your second factor, which they're unlikely to have.
What are common second factors?
A code texted or generated by an app, a hardware key, or a fingerprint or face scan.

Part of the guide: How the Internet Works →