What is the "Docker Subnet" used for? - Stack Overflow

What is the "Docker Subnet" used for? - Stack Overflow
https://stackoverflow.com/questions/62849480/what-is-the-docker-subnet-used-for

docker network create | Docker Documentation
https://docs.docker.com/engine/reference/commandline/network_create/

docker 网络配置 - 简书
https://www.jianshu.com/p/d84cdfe2ea86