FTP (File Transfer Protocol) is used to access shared files through the Internet. In order to share files, you will need to plug in a USB storage device on the USB port on the back of the router. You can set access to the FTP to require authentication or anonymous (no authentication). Once enabled, the FTP is accessible locally from the LAN/WLAN interface. You must enable the option Remote Access to be able to access the FTP from the Internet.