Thriller definition

One definition of a thriller film is

"Thrillers often overlap with mystery stories, but are distinguished by the structure of their plots. In a thriller, the hero must thwart the plans of an enemy, rather than uncover a crime that has already happened; while a murder mystery would be spoiled by a premature disclosure of the murderer's identity, in a thriller the identity of a murderer or other villain is typically known all along. Thrillers also occur on a much grander scale: the crimes that must be prevented are serial or mass murder, terrorism, assassination, or the overthrow of governments. Jeopardy and violent confrontations are standard plot elements. While a mystery climaxes when the mystery is solved, a thriller climaxes when the hero finally defeats the villain, saving his own life and often the lives of others. In thrillers influenced by film noir and tragedy, the compromised hero is often killed in the process."

In our words a thriller is a film filled with mystery and throughout the film the audience has to try and guess from little pieces of information what the plot is. Often there are hidden messages or meanings