Ambiance

In filmmaking, ambiance is the atmosphere created through sound, consisting of the sounds of a given location or space. It is the opposition of 'silence.' Every location has distinct and subtle sounds created by its environment. These sounds include wildlife, rain, running water, thunder, leaves rustling, footsteps, cars going by, machinery noise, music, speech, etc. If ambient sound doesn't fit with the film, the audience will feel confused, so it generally doesn't contradict with what is being shown, and would be seen as asynchronous or contrapuntal sound.