What is custom? When did he appear? Why was the rule of custom in the tribal community carried out unquestioningly?

What is custom? When did he appear? Why was the rule of custom in the tribal community carried out unquestioningly? Why did people change the rules from time to time?

A custom is a habitual, established order of behavior passed down from fathers to children. The custom was carried out unquestioningly because only this helped to survive in difficult situations. after all, it was believed that failure to comply with the rules could lead to various disasters. That is why violation of the rules was severely punished, and the most severe punishment was expulsion from the community. The change in the established rules was associated with the development of mankind.