Bonjour is Apple's implementation of zero-configuration networking (zeroconf), a group of technologies that includes service discovery, address assignment, and hostname resolution. Bonjour locates devices such as printers, other computers, and the services that those devices offer on a local network using multicast Domain Name System (mDNS) service records.
The software comes built-in with Apple's macOS and iOS operating systems. Bonjour can also be installed onto computers running Microsoft Windows. Bonjour components may also be included within other software such as iTunes and Safari.
After its introduction in 2002 with Mac OS X 10.2 as Rendezvous, the software was renamed in 2005 to Bonjour following an out-of-court trademark dispute settlement.
Bonjour provides a general method to discover services on a local area network. The software is widely used throughout macOS, and allows users to set up a network without any configuration. it is used to find printers and file-sharing servers.
Notable applications using Bonjour include:
iTunes to find shared music
iPhoto to find shared photos
Adium, Pidgin, Vine Server, and Elgato EyeTV to communicate with multiple clients
SubEthaEdit to find document collaborators
Solidworks and PhotoView 360 used for managing licenses
Things and OmniFocus to synchronize projects and tasks across the Mac desktop and the iPad, iPhone or iPod touch
Safari to find local web servers and configuration pages for local devices
Software such as Bonjour Browser or iStumbler, both for macOS, can be used to view all services declared by these applications. Apple's "Remote" application for iPhone and iPod Touch also uses Bonjour to establish connection to iTunes libraries via Wi-Fi.
Bonjour only works within a single broadcast domain, which is usually a small area, without special DNS configuration. macOS, Bonjour for Windows and AirPort Base Stations may be configured to use Wide Area Bonjour which allows for wide area service discovery via an appropriately configured DNS server.
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