: This refers to the audio format . It stands for "Dolby Digital 5.1" surround sound (five speakers and one subwoofer).
The text you provided is a standard for a digital movie file. It uses a specific naming convention that tells you exactly what you're looking at. 1080p.WEB-DL.DD5.1.H.264-EVO" means: subtitle Risen2021.1080p.WEB-DL.DD5.1.H.264-EVO...
: This is the source . It means the file was downloaded directly from a streaming service (like Netflix, Amazon, or iTunes) without being re-compressed, which usually results in high quality. : This refers to the audio format