The Wave is mainly fictional. It might draw inspiration from some real-life concepts or situations, but it's not directly based on a specific true event or story.
To be honest, I don't have definite information. Sometimes stories have elements of truth mixed with imagination. You might need to research more about the background of 'Wave' to know for sure.
Yes, 'The Wave' is based on a true story. It's inspired by a real - life experiment that took place in a high school in California in the 1960s. The experiment was designed to show how easily people could be influenced and how quickly a group could turn into a sort of authoritarian regime within a short time, just like in Nazi Germany. This film does a great job of bringing that concept to the big screen and making viewers think about the power of group dynamics and the importance of individual thinking.