Horror is a genre that uses explicit violence and gore to frighten viewers, emerging in the late 19th century with films like Frankenstein and Nosferatu. As technology advanced in the 1950s, horror shifted from gothic themes to concerns more relevant to modern audiences, dividing into films about Armageddon and demonic possession. One famous example is The Exorcist from 1973, about a teenager possessed by an entity where her mother seeks priests for help.