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What makes a thriller what it is? It's hard to say. The thriller genre contains many different sub genres such as Psychological Thrillers and Crime Thrillers and can overlap with many other genres such as horror and action.
According to the Oxford dictionary, a thriller is "A novel, play or film with an exciting plot, typically involving crime or epsionage." This leaves thrillers open to be about whatever the writers want as long as it stimulates a 'thrill' for the audience.
However, Thrillers typically do tend to have certain characteristics that define them from other genres like horror.
Click here to read about Thriller Characteristics.