We dress up for Halloween because the tradition originated from the ancient Celtic festival of Samhain, where people wore costumes and masks to disguise themselves as spirits or malevolent beings. This was meant to ward off and protect against wandering spirits during a time when the boundary between the living and the dead was believed to be thin. Over the centuries, the custom evolved into dressing up not just to scare away spirits, but also for fun, self-expression, and storytelling. Today, Halloween costumes allow people to creatively transform into a wide variety of characters, from scary monsters to pop culture icons, while keeping the spirit of community and celebration alive.