Short for "Audio CD Rip." This indicates the audio was extracted directly from the original retail compact disc rather than being recorded from a theater or compressed from a streaming site.
Files shared via Google Drive links with these naming conventions are often found on community forums or indexing sites. Simmba.2018.ACDRip.FLAC.Lyrics.DDR.rar - Google Drive
If you are accessing this link, ensure it is from a trusted source. Short for "Audio CD Rip