Networking in Docker Compose

1st chunk of `content/includes/compose/networks.md`

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Networks let services communicate with each other. By default Compose sets up a single network for your app. Each container for a service joins the default network and is both reachable by other containers on that network, and discoverable by the service's name. The top-level `networks` element lets you configure named networks that can be reused across multiple services.

Title: Networking in Docker Compose

Summary

Docker Compose automatically creates a default network for applications, enabling inter-container communication and service discovery using service names. The `networks` element allows defining reusable, named networks for more complex configurations.