A thriller is a genre of film, literature, and television that uses suspense, tension and excitement to engage the audience. Thrillers can include elements of drama, crime, action, horror, science fiction, and classical thriller tropes. They tell stories ranging from murder mysteries to dramatic relationships. Thrillers use techniques like music, lighting, characters, and storylines to create tension and suspense and keep the audience engaged. They typically involve a hero and a villain, with the hero prevailing in the end, though the themes of thrillers can vary greatly.