You as the author must remain invisible so your readers can immerse themselves within the world of your story. You can show the reader what's happening in several places at once, but you don't get close to any one character or see their thoughts. An entire book written with the omniscient point of view does not allow the reader to identify with any one character or know whose story you are telling. While most children's books encompass one main character and one point of view, some young adult novels alternate points of view between two or three main characters. This is best done when entire chapters focus on one character and one viewpoint.
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