What is Iconography?

Iconography is mainly used in films and TV including trailers for such medias. Iconography is used to add emphasis to a certain genre to make it more recognisable to it's target audience. For example, if there was a new western movie out, we would expect to see scenes consisting of dusty roads and men dressed as cowboys, whereas in a Bollywood movie, bright colours dance sequences are likely to be seen. In some sense, it's similar to mise-en-scene due to the fact it's based on clothing, objects, and set.