Sound effect involves us with on screen actions, put us in the film's reality i.e. making on screen space believable, it complete the illusion of an action for example closing of a door, hitting etc. Sound Effects provide continuity and tell off-screen story cheaply and quickly. Even in no narrative animation films, various wooshes and zaps call attention of the viewers. They are created from scratch or by manipulating the existing sound.
Techniques for acquiring Sound Effects are: