FTPS (FTP with security) adds SSL or TLS encryption to FTP. Many modern ftp clients and servers can be configured to support this capability. FTPS provides protection from eavesdroppers and man in the middle attacks. Its use is highly recommended for security sensitive FTP connections wherever it's supported, as otherwise authentication and communications are handled in plain text. Also consider SFTP, which is a secure file transfer protocol that doesn't use FTP.