Halloween costumes are outfits worn during the celebration of Halloween, which takes place on October 31st each year. People of all ages dress up in various themes, ranging from spooky characters like ghosts and witches to popular figures from movies, books, or history. Costumes can be homemade or purchased from stores, and they often include accessories like masks, hats, and props. The tradition of wearing costumes on Halloween dates back to ancient Celtic festivals, where people would disguise themselves to ward off evil spirits. Today, costumes are a fun way to express creativity and participate in festivities, including trick-or-treating, parties, and community events.