The reason is that moon cakes can be used as offerings to worship the moon god. Sacrificing the moon is a very old custom in our country, and it is actually a worship activity of the ancients to the "Moon God". Up to now, eating moon cakes and enjoying the moon during the Mid-Autumn Festival is a necessary custom in all parts of China. Moon cakes symbolize a happy reunion. People regard them as holiday food, and use them to worship the moon and give them to relatives and friends.

Extended data:

Mooncakes symbolize reunion and should have been recorded in writing since the Ming Dynasty. If we look at the information about moon cakes and Mid-Autumn Festival folklore in Ming Dynasty, we should be able to see the historical track of reunion of moon cakes: after the Mid-Autumn Festival, the whole family will sit around and share the moon cakes and fruits. Because the moon cake is also round, and it is shared by the family;

Therefore, the implication that mooncakes represent family reunion has gradually formed. In some parts of Guangdong, there is a custom of Mid-Autumn Festival in Yue Bai, mainly for women and children. There is a common saying that "men don't have a full moon, and women don't sacrifice stoves". Folk customs in the south of the Yangtze River are also varied during the Mid-Autumn Festival. In addition to eating moon cakes, Nanjing people must eat osmanthus duck, a famous dish of dancing dragon Jinling. In addition to eating moon cakes, people in Sichuan Province also eat Ciba, kill ducks, eat sesame cakes and honey cakes during the Mid-Autumn Festival.