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What Is an Authenticator App?

An authenticator app is a tool that helps protect your online accounts by adding an extra layer of security called two-factor authentication (2FA) or multi-factor authentication (MFA).

Why Use One?

Even if someone knows your password, they can’t log in without a special code from your authenticator app.

These codes:

  • Are time-based (change every 30 seconds)
  • Are only available on your device
  • Work offline (no internet or cell service needed)

How It Works

  1. You install the app on your phone or computer.
  2. When you log into a website, after entering your password, you’ll be asked for a code.
  3. Open the app, find the code for that site, and type it in.

It’s like having a digital key that only you can use.

Popular Authenticator Apps by Platform

Here’s a breakdown of trusted apps that work across different operating systems: