The importance of sound

The sound is extremely important in order to create suspense. This feature is used to set the mood of the scene and also to add a realistic atmosphere. To create a realistic atmosphere the opening of a film or the film in general need to have the sound of footsteps, the rustle of clothes ,doors opening, etc; as these sounds are very subtle when they are recorded as a diegetic sound, they have to be added during post-production.This technique  is called the Foley Sound Effects.

These sounds have to be created with extreme precaution to making them heard real and be able to synchronize them with the movement. In many cases the foley sound is not made it with the same object as appears on the screen or in case of footsteps can be made on a different kind floor. This is because the sound has to look real and in many cases the real sound does not hear real. For instance if a man is walking on a ceramic floor, to improve the sound the sound technician will step on a special wood to make it better.