Thrillers are films that use suspense, tension, and excitement to keep audiences alert and on the edge of their seats. Common subgenres include psychological thrillers, crime thrillers, and mystery thrillers. Thrillers emphasize the danger that the protagonist faces in solving a problem like a mission, escape, or mystery. While horror aims to invoke fear through gruesome images, thrillers focus more on psychological suspense through their intricate storylines.