DNS-based service discovery. Allows clients to discover available services provided by a device (which might not be obvious just by using standard DNS to find out its name). The specification is compatible with existing unicast DNS server and client software, but works equally well with Multicast DNS (mDNS) in a zero-configuration environment. Used by Bonjour.
One of several systems that provide a similar service. Others include NetBIOS Service Discovery, WS-Discovery, UPnP, DLNA
