A trusted person or account that can unlock encrypted files if the owner's key is lost.
Like the spare master key kept in the manager's safe for the day an employee loses theirs.
An employee left a firm after encrypting a project folder. The account was deleted, no recovery agent had been set up, and the folder could not be opened again.
Password Manager keeps recovery keys in shared, encrypted vaults so they are available when someone needs them.
What happens if nobody can unlock the files?
Without a recovery agent or saved recovery key, strong encryption usually cannot be broken, which is why the key needs a safe home before it is needed.
Every WILDCARD card exists to solve one named problem. Find yours.