Why are plays divided into acts and scenes?

Longer plays (longer stories) are divided, but not all. Here's info on one-act plays:

https://www.google.com/search?q=one-act+plays&oq=one-act+plays&aqs=chrome..69i57.4574j0j7&sourceid=chrome&ie=UTF-8

To find the answer to your particular question, you have to go back into literary history -- Roman times, to be specific:
https://www.google.com/search?q=why+divide+plays+into+acts+scenes&oq=why+divide+plays+into+acts+scenes&aqs=chrome..69i57j69i60.7231j0j9&sourceid=chrome&ie=UTF-8

D- to organize the plot of the play

You have to have a break to organize

Plays are divided into acts and scenes to enhance the structure and organization of the storytelling. These divisions provide a framework for the narrative, making it easier to follow the plot and character developments. Let me explain how acts and scenes work in a play:

1. Acts: Acts are major divisions within a play, similar to chapters in a book. They usually represent significant shifts in time, location, or the progression of the story. Acts can also help create a sense of pacing and build tension. In most plays, there are typically three or five acts, although this can vary.

2. Scenes: Scenes are smaller subdivisions within acts and serve to break down the action into more manageable units. They often involve a change in characters, setting, or time within a specific act. Scenes allow for a more detailed exploration of specific moments or interactions, helping to develop the plot or deepen the characterization.

The division of plays into acts and scenes provides several advantages:

1. Structure: Acts and scenes establish a clear structure, guiding the audience through the various parts of the play. This helps maintain coherence and prevents the story from becoming confusing or overwhelming.

2. Dramatic impact: The deliberate arrangement of acts and scenes allows for key dramatic moments to be strategically placed to enhance their impact. It enables the playwright to control the pacing, tension, and emotional intensity of the play, creating climaxes and resolutions at appropriate intervals.

3. Practical considerations: Acts and scenes aid in the production aspects of a play, providing cues for set changes, lighting adjustments, and props. They make it easier for the director, designers, and stage crew to coordinate and execute smooth transitions between different settings or time periods.

4. Navigation: Dividing the play into acts and scenes makes it easier for performers, directors, and readers to locate specific sections of the text for rehearsal, analysis, or reference.

So, the division of plays into acts and scenes serves both artistic and practical purposes, helping to enhance the audience's understanding and enjoyment of the theatrical experience.