Subtitle Black.widow.2021.1080p.br.x264.aac.6ch... -

This specific naming convention is a "scene" standard used to identify the quality and source of the file: The title and theatrical release year. 1080p: The resolution (High Definition, 1920x1080 pixels).

If the audio and text don't match up exactly, you can use these tools to fix the "offset": subtitle Black.Widow.2021.1080p.BR.x264.AAC.6ch...

The audio format (Advanced Audio Coding) with 6-channel (5.1 surround sound) support. Where to Find the Subtitles This specific naming convention is a "scene" standard