What is a Thriller?

Some different films that are classed as Thrillers are;
-North By Northwest 
-Psycho-Paranormal Activity

-Birds

-127 Hours Manchurian Candidate
-Seven

                                                                                   

All different films with in the Thriller Genre are

then seperated by different types of Thrillers, such as;

-Spy

-Political

-Conspiracy

-Psychological
-Legal