Director's Commentaries

com·men·tar·y  (kmn-tr)

n. pl. com·men·tar·ies

1. A series of explanations or interpretations.

2. An expository treatise or series of annotations; an exegesis. Often used in the plural.

3. An apt explanation or illustration: a scandal that is a sad commentary on national politics.

4. A personal narrative; a memoir. Often used in the plural.

A director's commentary is an audio file, sometimes accompanied by interjections of video of the commentator,  that can be evaluative summary of the production, screen action and thoughts and opinions of actors, producers or directors.