Extended Display Identification Data is information a display supplies to a connected source about its supported capabilities and identification. A source can use that information when choosing output arrangements. Receivers, adapters or other intermediate equipment can affect the information exchanged, so the complete connection chain matters when diagnosing an unexpected picture or sound mode.
A practical example
A streaming box may offer different output choices when connected directly to a television than when routed through another device. The difference can reflect the capabilities reported through that connection chain rather than a change in the original programme.
A common misunderstanding
Do not assume that an available output option is always the best choice for every source. Reported capability, actual implementation and the user's intended audio or display arrangement still need to align.
Related terms
Stable technical definition. Editorial approach