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@@ -32,6 +32,28 @@ An image that has no parent is a **base image**.
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[boot2docker](http://boot2docker.io/) is a lightweight Linux distribution made
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specifically to run Docker containers. The boot2docker management tool for Mac and Windows was deprecated and replaced by [`docker-machine`](#machine) which you can install with the Docker Toolbox.
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+## bridge
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+
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+In terms of generic networking, a bridge is a Link Layer device which forwards
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+traffic between network segments. A bridge can be a hardware device or a
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+software device running within a host machine's kernel.
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+
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+In terms of Docker, a bridge network uses a software bridge which allows
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+containers connected to the same bridge network to communicate, while providing
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+isolation from containers which are not connected to that bridge network.
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+The Docker bridge driver automatically installs rules in the host machine so
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+that containers on different bridge networks cannot communicate directly with
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+each other.
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+
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+The default bridge network, which is also named `bridge`, behaves differently
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+from user-defined bridge networks. Containers connected to the default `bridge`
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+network can communicate with each other across the bridge by IP address but
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+cannot resolve each other's container name to an IP address unless they are
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+explicitly linked using the `--link` flag to `docker run`.
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+
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+For more information about Docker networking, see
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+[Understand container communication](https://docs.docker.com/engine/userguide/networking/default_network/container-communication/).
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+
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## btrfs
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btrfs (B-tree file system) is a Linux [filesystem](#filesystem) that Docker
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Misty Stanley-Jones