In terms of Docker, a bridge network uses a software bridge that allows containers connected to the same bridge network to communicate, while providing isolation from containers that are not connected to that bridge network.
The Docker bridge driver automatically installs rules in the host machine so that containers on different bridge networks cannot communicate directly with each other.
Bridge networks apply to containers running on the same Docker daemon host. For communication among containers running on different Docker daemon hosts, you can either manage routing at the OS level, or you can use an overlay network.
When you start Docker, a default bridge network (also called bridge) is created automatically, and newly-started containers connect to it unless otherwise specified. You can also create user-defined custom bridge networks. User-defined bridge networks are superior to the default bridge network.
Read more here on the differences and benefits: https://docs.docker.com/network/bridge/#differences-between-user-defined-bridges-and-the-default-bridge
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