Networking
Mac computers can be connected through networks in many ways.

Networks
Integrating a Mac into a Mac-network is very easy. Mac OS X allows you to add Macs to networks that mix Windows, Mac OS and UNIX computers. Mac OS X 'talks' to most of the popular file server protocols that are used on today's major server platforms.

Wired or wireless
Whether it is Ethernet, Wifi (Airport) or Blue Tooth. Mac OS X offers standard support.

Bonjour
In addition to the networking facilities as mentioned before Mac OS offers Bonjour, a networking technology automatically connecting devices (printers, laptops, desktops, cameras, etc.) on a network.

More info about Bonjour available on the Apple - Mac OS X site: Bonjour Networking, simplified