What is a Thriller?

A thriller is a novel, play, or film with an exciting plot usually involving crime or espionage (spy), with a very exciting contest or experience 
Another definition would be a genre of film that uses suspense, tension and excitement as it's main elements.
Many Thrillers use cross genres to make the film attract to a wider audience.

Orphan- Director: Jaume Collet-Serra

Different types of thrillers-

• Horror Thrillers such as Final Destination and The Cabin in the Woods- seeking to elicit a negative emotional reaction from viewers by playing on the audience's primal fears
• Psychological Thrillers such as The Silence of the Lambs and Black Swan-is a fictional thriller story which emphasises the psychology of its characters and their unstable emotional states
• Crime Thrillers such as Batman- theses are thrillers that have a focus point of breaking the law, which normally include villains 
• Romantic Thrillers such as Vertigo- narratives that's includes both romance and thriller
• Supernatural Thrillers such as Paranormal Activity- involves supernatural behaviour within one or more characters 
• Action Thrillers such as Seven- containing scenes of violence throughout the film