The document provides a history of the horror genre, beginning with its origins in the late 18th century with novels like The Castle of Otranto and Frankenstein. It notes that the first horror films emerged in the late 19th century and were usually silent. Key early horror films that helped establish the genre included The Cabinet of Dr. Caligari in 1919 and Dracula in 1931. The document outlines some subgenres and popular horror franchises, and discusses how monsters have evolved representations of societal fears over time and how audience expectations have changed with advances in technology.