The term 'plot line' is used to refer to the sequence of events that make up a STORY. It is the backbone of any narrative, and it is what drives the action forward. Plot lines can be linear or non-linear, depending on the type of STORY being told. The plot line is often used to introduce characters, set up conflicts, and provide resolution. It is also used to create suspense and tension, as well as to provide insight into the motivations of the characters.