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DLNA = Digital Living Network Alliance

DLNA is the alliance networking devices which can work together. If the device had passed to check following the DLNA specifiation, it could show DLNA logo. The sound likes BDA standard in Blu-Ray DVD.

In the easy way to understand DLNA:
DLNA is established to work interoperate between network devices by focus on sharing multi-media in the home network. DLNA must be supported uPnP (Universal Plug and Play). uPnP is a network sharing protocol with zero configuration. However, it have to config in the server side. After the devices is plugged, other connected devices can see files in the server.