It can be seen as a self-contained segment that significantly advances the plot and develops the characters. Acts are traditionally used to organize and present the story in logical chapters.
The division into acts often reflects significant turning points or shifts in the storyline. These divisions help create dramatic tension and pacing in the plot. Each act might focus on specific sets of characters, subplots, conflicts, or thematic elements.
In older times, acts were sometimes separated by intermissions in theater productions, allowing brief pauses for the audience and preparation for the next segment of the play.
It's worth noting that the use of acts may vary depending on the structure and format of the play. There isn't a fixed number of acts, and some theatrical works can be presented in just one act, while others may have multiple acts and scenes within those acts. The playwright uses this act structure to tell the story effectively and enhance the overall dramatic experience.