Two-Factor Authentication (2FA) is a specific type of multi-factor authentication that requires exactly two different methods to verify your identity before granting access to an account or system.
The most common form of 2FA combines something you know (your password) with something you have (typically your mobile phone). When you log in, you enter your password as normal, then receive a one-time code via text message, authenticator app, or email that you must enter to complete the login.
For example, when accessing your online banking, you might enter your password and then be sent a six-digit code to your mobile that expires after a few minutes. This means that even if someone steals or guesses your password, they still can’t access your account without also having your phone.
2FA is essentially a simpler, more specific version of MFA (Multi-Factor Authentication). Whilst MFA can use two or more authentication factors, 2FA always uses exactly two. The terms are often used interchangeably, though technically 2FA is a subset of MFA.
For UK businesses, implementing 2FA is one of the quickest and most cost-effective security improvements you can make. It’s mandatory for Cyber Essentials certification and stops the vast majority of account takeover attempts. Common methods include SMS codes, authenticator apps like Microsoft Authenticator or Google Authenticator, and hardware security keys.
GoodChoice IT helps London and Surrey businesses roll out 2FA across Microsoft 365, email systems, VPNs, and other critical applications, ensuring your team can use it easily whilst maintaining strong security.
« Back to Glossary Index