NFS

Network File System, an insecure but sometimes very valuable tool. Essentially, you can export a directory or directories that other computers can mount as local directory that users of your system can access locally. This can be handy for e.g., keeping a central repository of data on one server and sharing the data to other servers or extra storage. It should be noted that NFS is not a secure service and should not be done over the net in the clear. If you must use NFS, use it only between machines that are local to you.