: The audio codec. Advanced Audio Coding (AAC) is a standard format for lossy digital audio that generally provides better sound quality than MP3 at similar bit rates.

: After a disappointing theatrical run, it found a second life on streaming platforms, which is where "WEB-DL" files like the one in your query originate.

: Indicates the audio is a High-Quality (HQ) Hindi dub, rather than the original language (Malayalam) or a low-quality "cam" recording of the audio.