A thriller is a genre of film that uses suspense and tension to provide viewers with a high level of anticipation and uncertainty. Thrillers aim to be fast-paced and adrenaline-rushing. There are many sub-genres of thrillers, including comedy thrillers, conspiracy thrillers, disaster thrillers, and psychological thrillers. Thrillers also have hybrid genres that blend elements of two or more genres, such as the disaster thriller film "The Day After Tomorrow." Common thriller sub-genres are psychological thrillers, crime thrillers, erotic thrillers, mystery thrillers, and spy thrillers, which involve fictional espionage. The horror and action genres also often overlap with thrillers.