What's the difference between onomatopoeia and sound effects?

The onomatopoeia word is "simulation" and the sound effect is "editing".

On the level of sound effect file, traditional onomatopoeia (sound effect) refers to the sound effect produced by human activities such as "clothes sound, footsteps sound, props sound".

The behavior of onomatopoeic words is that onomatopoeic words perform in real time according to the picture and produce the required sound effects.

For example, the picture (or script) describes the scene of "a person sitting in front of a computer constantly tapping the keyboard and occasionally drinking a cup of coffee".

What the imitator has to do is really sit down and knock with a keyboard. The people in the picture drink coffee, and the actors put cups down. All the sounds are recorded in one trip. This is the sound of imitation.

The sound engineer found a lot of related sound materials, such as "types" and "drinks", and then put each sound effect on it according to the picture to make a good position and effect. This is the sound effect.