What does it mean to ask for a marriage certificate?

Folk marriage documents originated in the early years of the Tang Dynasty, when they were written by hand, mostly in red paper and ink, including marriage proposal cards, engagement forms and marriage forms, with the birthdays of both men and women, references, officiators, betrothed persons, married people, grandparents and even great-grandmothers' names written on them. After 19 12, most wedding documents were printed in ink. In addition to rice paper, the texture of wedding books also includes hard copy, silk surface, wool paper and so on. Some of them are painted with gold powder.