Storyline paths, also known as arcs, are a narrative structure used in storytelling. They are the paths that characters take in order to reach a resolution or climax in a story. Arcs are often used to create suspense and tension, as well as to provide a sense of direction and purpose for the characters. Arcs can be linear, non-linear, or a combination of both. They can also be used to explore different themes and ideas within a story.