Story trajectories, also known as story arcs, are the paths that a story follows from beginning to end. They are the overall structure of a narrative, and can be divided into three main categories: rising action, climax, and resolution. Rising action is the part of the story where the conflict is introduced and built up, climax is the point of highest tension, and resolution is the part of the story where the conflict is resolved. Story trajectories are important for creating a cohesive narrative and engaging readers.