The regular FTP is insecure. When connecting using FTP, passwords are sent in plain text (unencrypted).
It is recommended to use Secure FTP as a more secure solution to transfer your files.
FTPS for Windows Hosting
File Transfer Protocol over SSL (FTPS) is only offered with our Windows Hosting packages.
SFTP for Linux Hosting
SSH File Transfer Protoco (SFTP) is different from FTPS in that it can only be used when connecting to a Linux Server. SFTP can be used with any Linux package that includes SSH user access.
For additional information, you may want to reference: