The SFTP allows you to transfer files over SSH File Transfer Protocol (SFTP) using SSH version 2. After authentication, a connection is established between your local system and remote server so you can transfer your data files & directories. It also enables you to resume file transfer if any interruption occurs.
The SFTP protocol runs on a secure channel – no clear text passwords or data files are transferred without encryption. When using SFTP instead of FTP, the entire login session including transmission of password is encrypted. It is therefore much more difficult for an outsider to observe and collect passwords from a system using SSH/SFTP sessions. Therefore, the advantage of SFTP protocol is that your data remains secure during the entire process of transmission.
SFTP solutions use high data encryption with public key advanced authentication for file access. The authentication involves computer generated keys – both ‘private’ (known to you) and ‘public’ (accessed by anyone), which work alongside each other.