This is an alternate, presumably pre-encrypted or otherwise obscured secret field for authenticating xftp (FTP/SFTP) transfers to this server, distinct from the plaintext password object on the same row. Having both a plaintext password object and a separate secret object suggests these serve different transfer-mode or encryption needs; an admin should confirm which of the two the active transfer-mode setting actually consumes, rather than assuming both need to be populated identically. For example, an admin migrating from FTP using the plaintext password to SFTP with key-based or encrypted-secret auth might need to populate this secret object instead, while the old password field becomes irrelevant to the new transfer mode.