To be honest, I have no idea. It depends on various factors like where you heard about it and the context. Maybe it's a fictional creation or based on real events but with some alterations.
In Act 1 of a 3 act story structure novel, the key element is the introduction. This includes introducing the main characters, the setting of the story, and the basic situation. For example, in a detective novel, we meet the detective and learn about the crime scene. Act 2 is about conflict. The main character faces problems and tries to overcome them. The detective might be chasing false leads or facing a dangerous suspect. Act 3 has the resolution. The mystery is solved, and the story concludes.
For Act 1 of the '4 act story structure novel', the essential element is laying the foundation. We get to know who the story is about and where it takes place. Act 2 focuses on building the conflict. It can be internal (a character's doubts) or external (enemies). Act 3 is about the peak of the story. It's the moment when everything seems at stake. Act 4 is about bringing closure. It answers all the remaining questions and shows the final state of the characters.
The story behind the act often has multiple layers. It could be a response to a challenge, a pursuit of a goal, or an outcome of a series of decisions made over time.
It's hard to say for sure. The act might have some roots in reality, or it could be a total work of imagination. You'd have to do some research or ask the creator to know for sure.