Here's a breakdown:
* Plot line: This is the main story of the novel, the primary sequence of events that drives the narrative. It usually focuses on the protagonist and their journey.
* Sub-plot: These are smaller stories within the novel that are interwoven with the main plot. They can involve supporting characters, explore different themes, or add complexity and depth to the overall narrative.
Other terms used to describe stories within novels include:
* Narrative arc: This describes the structure of a story, from its beginning to its end, including the rising action, climax, and falling action.
* Storyline: This is a broader term that encompasses both the plot line and sub-plots, and can also refer to the overall narrative structure of the novel.
Ultimately, the specific term used will depend on the context and the specific aspect of the story being discussed.