FTPS (FTP over SSL) provides both encryption and authentication support as compared to SFTP that offers only encryption support.
When using FTPS for data transfer, you can choose to encrypt your credentials, and also the data being transmitted to the server. In addition, you can choose to authenticate the server’s credentials and connections. The credentials of a server are validated against the current set of trusted CA server certificates in the Dreamweaver database. Certificate Authorities (CAs), which include companies like VeriSign, Thawte, and so on, issue digitally signed server certificates.