A password alone can be stolen, leaked or guessed. Two-factor authentication (2FA) adds a second step that does not depend on your password. Someone who knows your password still cannot log in without that second step.
Each user sets up 2FA in their own account settings. You choose an authenticator app, such as Google Authenticator, Microsoft Authenticator or Authy, or a code by e-mail. The app generates the code on your own device; it changes every 30 seconds.
Once 2FA is on, every login asks for the second step. ZelixAI does not use SMS codes and has no recovery codes, so make sure you keep access to the app or mailbox you chose.