A base layer feature of Hive that allows users to recover their account if their master or owner key was stolen.
The Hive blockchain has the ability to reset one's passwords. However, if a hacker got a hold of those keys, changing the password might not be possible.
Hive's account recovery system allows an individual to name another account as the recovery account. If one needs to initiate a recovery, the other person will have to confirm the identity to ensure the owner of the account is actually initiating it.
This is a security feature so that people can protect their cryptocurrency.