Sshfs is a file system for operating systems that have FUSE (Filesystem in Userspace) implementation. Examples of such operating systems are Linux, Mac OS X and FreeBSD but not limited to these. SSHFS is a great tool as it enable a user to mount remote directories on the local machine securely. The SSH protocol encrypts the connection between the local and remote machine. This makes it difficult for a third party to see the files being exchanged between the two machines on the network.

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How to use sshfs (Secure Shell FileSystem) to Mount Remote Directories Locally (LinOxide)
Related:
SSHFS (Secure SHell FileSystem) for Mounting Remote Linux Filesystems (Tecmint)
Mount Remote Filesystems Over SSH Using SSHFS (Unixmen)
SSHFS in Linux (Linux/Vmware Solutions)
Linux Terminal: sshfs, Remote directory over ssh (Linuxaria)