The Definition Of Suspense

1. The condition of being physically suspended.

2.

a. The state or quality of being undecided, uncertain, or doubtful.

b. Pleasurable excitement and anticipation regarding an outcome, such as the ending of a mystery novel.

3. Anxiety or apprehension resulting from an uncertain, undecided, or mysterious situation.

Thriller films are known to use suspense, tension and excitement to build up an interesting watch for the audience. There are many sub genres of thriller which all use similar techniques to create an eventful viewing. Some sub genres of thriller include:

Psychological thrillers
Mystery thrillers
Romantic thrillers
Techno thrillers
Rape and Revenge thrillers
Crime Thrillers
Political Thrillers

Here is a scene from 'The Machinist' in which some techniques of suspense have been used. The Machinist is a psychological thriller and i think this particular scene is very effective due to the subtle suspense portrayed.