The first act, or opening narration, is usually used for exposition, to establish the main characters, their relationships, and the world they live in. Later in the first act, a dynamic incident occurs, known as the inciting incident, or catalyst, that confronts the main character (the protagonist). The protagonist's attempts to deal with this incident lead to a second and more dramatic situation, known as the first plot point, which (a) signals the end of the first act, (b) ensures life will never be the same again for the protagonist and (c) raises a dramatic question that will be answered in the climax of the film.