Sound effects are used in all types of film to create a sense of reality. For example, we see a car door open, we the viewer expect to hear is close. There are two types of sound in film: Diegetic and non-diegetic.
Diegetic.
Diegetic sound if the sounds and noises you would hear if you were in the movie such as dialogue and noises made from objects, processes and forces such as a clock ticking, a liquid pouring into a cup and the thud a person makes when jumping.
Non-Diegetc.
Non-diegetic sounds are the music that is overlaid to usually give suspense or evoke expectation and emotion within the audience. Another example is of when you can hear character's thoughts through a voice over- basically what no other character within the video can hear.
This clip is from the movie 'Strange than Fiction' which breaks the line between diegetic and non-diegetic sound. Will Farrell plays the character Harold Crick, an IRS employee who wakes up one day hearing a voice, narrating his actions to him. Voice overs are usually used to narrate to the audience in a non-diegetic way however, in this movie, the character can hear the voice.(SPOILERS!-which turns out to be an author, writing a book of which Harold Crick is the main character).
In my film production, I think it is important to include both types of sound as it makes a more realistic film. For non-diegetic, I could use eerie music over the top of silent parts of the film. For diegetic sound, I could use speech, or the sound of items interacting although the sound would have to be sharp to give the audience a shock.
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