This document discusses film sub-genres and provides examples. It defines sub-genres as variations within a broader genre that are similar yet different through iconic representations. The document notes that while audiences enjoy genre conventions, sub-genres evolved over time to maintain interest and reflect societal changes. As an example, it outlines how the action-adventure genre spawned sub-genres from the 1920s to 1990s like western, sci-fi, and thriller. It then focuses on the motorsports action-adventure sub-genre, comparing it to classic action-adventure through elements like the use of cars as weapons and different costumes.