Suspense is the feeling of anxiety and uncetainty experienced by the audience of a film. It creates tension and excitement. Films usually include suspense when awaiting a decision or a certain shock in a scene. Thriller films especially use this effect. It also creates uneasiness as the audience are not expecting of what may happen next.
Suspense keeps the audience alerted and interested. The sound or music in the scene contributes immensely to making the scene suspenseful. The music normally begins with a slow tempo then builds up to a much more fast and thumping sound which enables to increases the pulse rates of the audience, as it builds and creates more tension and anxiety.