As you already know, a network is a linkage system that allows computers and other hardware devices to communicate. A Docker network is the same thing. It is a linkage system that allows Docker containers to communicate with each other on the same Docker host, or with containers, computers, and hardware outside of the container's host, including containers running on other Docker hosts.
If you are familiar with the cloud computing analogy of pets versus cattle, you understand the necessity of being able to manage resources at scale. Docker networks allow you to do just that. They abstract away most of the complexity of networking, delivering easy-to-understand, easy-to-document, and easy-to-use networks for your containerized apps. The Docker network is based on a standard, created by Docker, called the Container Network Model (CNM). There is a competing...