SFTP (SSH File Transfer Protocol) is a network protocol that provides ssh-based file access, file transfer, and file management methods.
With SFTP, you can easily modify, browse, and edit files on Raspberry Pi. SFTP is easier to configure than FTP, because raspbian has enabled SSH by default.
Filezilla
Download the latest filezilla client for your operating system on the filezilla-project.org.
Start filezilla And Go To File> site manager ).
In the dialog box, enter the IP address, user name, and password of your Raspberry Pi (Default User Name Is Pi, and password is raspberry), and select SFTP.
Click Connect to view your home directory.
Ubuntu using Nautilus (Ubuntu uses Nautilus)
Open Nautilus on the client.
Select File> conncect to server
Type: sshserver: <the PI's IP address> port: 22 (default) User name: PI (default) password: Raspberry (default)
View the IP address.
Address: http://www.raspberrypi.org/documentation/remote-access/ssh/sftp.md
Use SFTP to manage files on Raspberry Pi