Two-factor authentication is one way to protect your information online. When you log in to a website or app, in addition to entering your password, you must also enter a code that is sent to your mobile phone. This means that, even if someone gets their hands on your password, they won't be able to access your information without the code. The code is one-time use and you only receive it on your phone, which makes it extremely secure. Two-factor authentication is a great way to protect yourself against cybercrime and keep your information secure.