This is the unique identifier for the specific upload group or site (in this case, SkymoviesHD).
Because this file uses the container, it is highly versatile. MKVs allow for multiple subtitle tracks and audio channels to be baked into a single file. For a 480p HDRip, you can expect a file size that is very "storage-friendly," making it a popular choice for users with limited bandwidth or older hardware.
This indicates the exact release date of this specific digital version.
This tells us the source was a high-definition digital stream, which was then "ripped" or encoded down.