A release name is like a fingerprint for a digital file. Here is what each part of this specific string means: : The title of the content (likely the BBC series : Season 02 of the series.
: Unlike Web-DLs which can have streaming artifacts, this is sourced directly from the physical disc, ensuring the best possible master for the encode.
Option 2: For a Personal Media Server (Plex, Jellyfin, Kodi) Sherlock - Season 2 (1080p BluRay x265 HDLight)
x265 handles compression well, but "HDLight" implies some loss of fine detail to save space.