Halloween is celebrated on October 31st in many countries. People believe that ghosts of the dead return to Earth on this day. Traditionally, people wore costumes, often depicting ghosts, witches or other scary figures, to ward off ghosts or pay tribute to the dead. Now, it is common for children to dress up in costumes and go trick-or-treating in their neighborhoods, receiving candy from houses. Popular Halloween activities include carving jack-o-lanterns from pumpkins and playing games like bobbing for apples.