Trick-or-treating is a Halloween tradition where children dress in costumes and go door-to-door in their neighborhoods. They knock on doors and say "trick or treat," prompting homeowners to give them candy or other treats. This activity usually takes place in the evening on October 31st. The origins of trick-or-treating can be traced back to ancient customs, including Samhain and All Hallows' Eve. Over time, it evolved into a fun community event, encouraging social interaction and creativity through costumes. Today, it is a popular way for families to celebrate Halloween together.