What is a Thriller?

A Thriller contains a meta-genre which are the emotions and reactions that should come from it, for example fear. Thrillers rely on the plot, fear in the audience, apprehension, suspense or you could just say basic worries that people have. These can be simple fears that make the audience emotionally involved. Thriller contain universal themes and work with a sense of delay because they use the time that the audience is waiting for something to happen to create suspense. Thrillers work because the are sadomsochistic because the audience likes seeing somebody else feeling discomfortable, they use ambivalence which means making the audience believe in what is happening and they are emotionally involved in what is happening.
There are different types of Thrillers, for example espionage or spythrillers like James Bond, Psychological Horror Thrillers like saw or supernatural thrillers like Drag me to Hell.
All of these genre are identified and classified by their key conventions which are the intricacy of plot, a complex unraveling narrative, a focus on fear, apprehension and suspense, a sense of delay and enigma codes which are mysteries and questions that the audience ask itself about what is happening and this also means that there is something unknown to the audience.
Other Conventions are that the audience pleasure derived from individuals discomfort and voyeurism, which means that we are aware of something that the character isn't.
If Thrillers contain each of these conventions they are good Thrillers and fulfil the expectations of the audiences.