A film director controls a film’s artistic and dramatic aspects and visualizes the screenplay (or script) while guiding the film crew and actors in the fulfilment of that vision. The director has a key role in choosing the cast members, production design and all the creative aspects of filmmaking.[1]

The film director gives direction to the cast and crew and creates an overall vision through which a film eventually becomes realized or noticed. Directors need to be able to mediate differences in creative visions and stay within the budget.

SOURCE – WIKIPEDIA