| Root media folder | A folder named in MEDIA_PATH / STREAM_MEDIA_ROOT. Libraries are built from folders inside roots. |
| Library | An admin-defined collection (for example Movies, TV Shows, Music) with a type and one or more folders. Stored in the database. |
| Item | A movie, series, episode, album or track in a library. |
| Scan | An indexer run over a library: discover, probe, fetch metadata, write items. |
| Direct play | The original file is sent unchanged. |
| Remux / DirectStream | Streams are copied into a browser-friendly container without re-encoding. |
| Transcode | Video and/or audio is re-encoded, for example to change resolution. |
| HLS | HTTP Live Streaming; segmented playback served by the streamer. |
| Stream token | Short-lived HMAC-signed token that authorises a browser to read from the streamer. |
| Topic | A named live data channel on the /api/live WebSocket (overview, streams, devices, indexer, shares). |
| Network share | An SMB share an admin adds so its files can be used by libraries. |
| Queue | An indexer work queue (scan, identify, metadata, images, probe, refresh) with its own worker count. |