These are the internal IDs from the file-sharing world.

The string of text you provided (e.g., "60fps", "mkvl", "free") appears to be a for a digital version of the DVD: MKV : A common video container format.

Think of this string as a set of precise coordinates. Each part tells you exactly what to look for.

Or, if you're looking to use it in a sentence or describe it:

The format (Matroska) is a highly versatile open-source container format. Unlike file types that only hold one video and audio stream, MKV can bundle high-definition video (like 60fps streams), multiple audio tracks, subtitles, and chapter metadata all into a single file.

The fascination with Miyuu Sasaki, particularly her "13 Pure Smile," can be attributed to several factors: