This is a file extension for a type of audio file. M4A files are typically encoded with AAC (Advanced Audio Coding) codec, which is known for providing high-quality audio at relatively low bitrates. This format is commonly used for music distribution, especially through digital music stores like iTunes.
A viral "love-kuthu" anthem that showcased the chemistry between Dhanush and Anirudh. maari 2015ost itunes rip m4avbr320kbps link
"Maari 2015" is the movie, correct? It's a Tamil film released in 2015. Then "OST" stands for Original Soundtrack. So they want a review of the soundtrack from Maari 2015, which they might have ripped from iTunes. The format is M4A, variable bit rate 320kbps. The user provided a link but wants a review of the link content. This is a file extension for a type of audio file