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. 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 sometimes overlap with thrillers.