Halloween originated in the 800s as a Catholic holiday and came to America in the 1840s. It represents a time for children to go trick-or-treating and receive candy without question, and for teens and adults to attend costume parties and celebrate freely. Key symbols of Halloween include the Jack O'Lantern, which originated from an Irish myth, as well as ghosts, witches, black cats, and vampires that aim to invoke fear. Famous horror movie characters are also common Halloween costume choices.