Thrillers aim to keep audiences on the edge of their seats through suspense and anticipation. They place protagonists in dangerous, mysterious, or impossible situations to escape from. Various techniques are used to build tension, including the use of shadows, editing, flashbacks, and certain colors. Thrillers come in different genres, such as action thrillers which use physical stunts and chases, crime thrillers about serial killers and robberies, and psychological thrillers that rely on the mind. Common themes involve revenge, survival, paranoia, terrorism, and mysteries. Characters include criminals, victims, assassins, and people with dark pasts. Alfred Hitchcock was famously known as the "master