Double authentication, often abbreviated to "2FA" (Two-Factor Authentication), is a crucial security measure in today's digital world. It strengthens the protection of your online accounts by adding an extra level of security beyond the simple password. This security method generally requires two separate steps to verify your identity before granting you access to an account or sensitive data.
The best-known and most widely used is TOTP with an application, but physical keys are the most secure and reliable.