: It might be part of a larger naming convention used by a person or organization to catalog digital content. The "143" could refer to a specific category, date, or sequence number.
At its core, is a website that facilitates the unauthorized distribution of copyrighted films, TV series, and web shows. The "mkv" in its name refers to the Matroska multimedia container format, a popular, open-standard free container format capable of holding an unlimited number of video, audio, picture, or subtitle tracks in one file. 143mkv