Password + SMS code.
When two-step verification is enabled, even if someone learns your password, they cannot log in without the code sent to your phone.
Privacy and security → «Two-step verification»
Add your phone number
Confirm the code
With a PIN, pattern, or fingerprint.
More detailsSee where you are logged in and log out the stranger.
More detailsYour account can be recovered even if you lose access.
More detailsYour protection level on one screen.
More detailsConfirm that your conversation partner is really who they claim to be.
More details