Bonjour is Apple's implementation of Zeroconf that is included with Mac OS X. Bonjour is a service discovery protocol which has the primary function of discovery services on a local area network (LAN). It uses multicast Domain Name System (DNS) service to locate devices such as computers, printers, and services that those devices offer. The beauty of this is that it allows non-experts to connect to these devices and services in an easy and automatic fashion. No complex DHCP or DNS messiness.