2FA authentication (which stands for two-factor authentication) is a security feature that helps protect your online accounts by adding an extra layer of verification to the login process.

Normally, when you log in to an online account (such as email, social media, or online banking), you need to provide a username and password to prove that you are the authorised user. With 2FA, you also need to provide a second piece of information, such as a code sent to your phone, a fingerprint, or a security token.

This means that even if someone manages to steal your username and password, they won't be able to access your account without also having the second piece of information that only you have. This makes it much harder for hackers or other unauthorised users to gain access to your accounts and steal your personal information.

2FA authentication is becoming increasingly popular as a way to improve online security and protect against identity theft and cyber-attacks. It's easy to set up and can be used on a wide range of devices and platforms, so it's a good idea to enable 2FA on any accounts that support it.