​Halloween has a history of over one thousand years. Originally a religious ritual, it became increasingly secular over the centuries until its religious symbols have all but disappeared. Today, Halloween is considered a holiday to dress up and have fun, especially for children.

The origins of Halloween can be traced to the ancient Celtic festival of Samhain, which falls on November 1 on the modern calendar. People believe that on that day, the souls of the dead will return home, so people put on costumes and light bonfires to drive away the ghosts. In this way, popular Halloween tropes such as witches, ghosts, and monsters became associated with the holiday.

Halloween was founded by Pope Boniface IV in the 7th century AD and was originally celebrated on May 13th. A century later, Pope Gregory III moved the holiday to November 1, most likely to replace the pagan holiday of Samhain with Christianity. The day before the saint’s celebration is known as All Hallows’ Eve or All Saints’ Day.Although the holiday originated in the Celtic regions of Ireland, England, and France, it soon spread to other parts of the world. New England's first American colonists were forbidden from celebrating the holiday for religious reasons, but it was popular in the southern colonies. By the 19th century, fall festivals marking the seasonal harvest incorporated Halloween elements, and Irish immigrants fleeing the devastating Potato Famine brought with them many Halloween traditions that remain today.

The custom of "trick-or-treating" has become popular in the United States, and various Halloween costumes are popular, such as Clown Costume, Grim Reaper Costume, Witch Costume, Monster Costume, etc. Today, many sellers produce and sell Halloween costumes, and Hao Wangjiao is one of them. The custom of children dressing up in Halloween costumes and begging their neighbors for candy became popular in the United States in the early 20th century as Irish and Scottish communities revived the Old World custom of "dressing up" in costume, telling jokes, reciting poetry or performing other pranks in exchange for a piece of fruit or other candy. By 1950, trick-or-treating had become one of the most popular Halloween activities.