Halloween is a festival celebrated at the end of October that originated from the Christian holiday All Hallows' Eve. On Halloween, children and adults dress up in costumes and children go door-to-door saying "trick or treat," receiving candy or other treats in return. Common Halloween symbols and vocabulary words include ghosts, pumpkins, witches, cats, spells, brooms, devils, and Frankenstein. Games related to Halloween include interactive stories, matching games, and a virtual haunted house.