Sound;

There are different sounds within the film;
Diegetic Sound - This is the sound that is linked to the film. It can be on screen or off screen. e.g. sounds of making tea.
Non-diegetic Sound - This is the sound that is not coming from the film itself. For example: backing music or narator.  
Parallel sound - this is music that fits into with the mood and atmosphere of the film.
Contrapuntal sound - this is when the music doesn't fit in with the mood and atmosphere of the film
Sound bridge - when sound is carried from one clip to the next.