Docker Compose for Multi-Container Apps
Docker Compose is a conductor for your containers. Instead of running each service manually, you define your app and its database in one YAML file and launch them together. This is standard for local Node.js/Postgres development.
Docker Compose is a conductor for multi-container applications. Instead of manually starting and networking individual containers for your app and database, you declare the entire environment in a single `docker-compose.yml` file. This is standard for local development where a Node.js app needs a PostgreSQL database. The most common footgun is connecting to `localhost`; inside a container, you must use the service name (e.g., `postgresdb`) as the hostname.
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