Samba[1] is the open version of the Microsoft "file sharing for Windows" SMB protocol[2]. This is used to share files on Linux servers with Windows clients.
The network shares on isolator and felixdisk, for instance, are served by Samba.
server - computer program or a device that provides functionality for other programs or devices, called clients
client - a piece of computer hardware or software that accesses a service made available by a server