They contain specific URLs pointing to live HLS (HTTP Live Streaming) feeds.
Most IPTV players do not require you to download a physical file; they allow you to paste a "Network URL." GitHub provides a "Raw" file view feature. This means you can copy the direct text URL of an M3U file hosted on GitHub and paste it into your player. Whenever the creator updates the file on GitHub, your player automatically loads the updated version the next time it boots up. 3. Crowdsourced Curation iptv m3u list github free
Metadata describing the channel, such as its ID, name, logo URL, and category group. They contain specific URLs pointing to live HLS