A storyline is the main sequence of events that forms the plot of a book, movie, play, or any other narrative. It's the backbone of the story: what happens, in what order, and how those events connect to create a beginning, middle, and end.

When you describe a movie's storyline to a friend, you're explaining the basic path the story follows: “It's about a girl who discovers a secret garden and works to bring it back to life, which helps her make friends and heal from sadness.” That's different from describing every single scene or detail; you're capturing the essential flow of what happens.

Most stories have a main storyline, but longer works often include subplots or secondary storylines running alongside the primary one. In a novel, the main storyline might follow a detective solving a mystery, while a secondary storyline shows her struggling to repair her relationship with her daughter.

Sometimes people use storyline and plot interchangeably, though plot often refers more to the specific structure of events, while storyline suggests the narrative thread you follow through the story. Writers spend considerable time developing their storylines, making sure each event leads naturally to the next and keeps readers wondering what happens next.