The secret answer is a confidential part of your account, just like your password. You should keep it a secret and not share it with anyone, not even your friends, your guild or a member of your family.
You will need it to carry out “sensitive” operations on your account. It’s an important part of your account’s security.
We will ask you for your secret answer whenever you want to change your password, email address, activate/deactivate the Authenticator, carry out a transfer between accounts or delete a character.