Docker Compose simplifies multi-container apps with a single declarative config file

Docker Compose allows developers to define and manage multi-container applications using a single YAML file, replacing multiple lengthy docker run commands. The tool automatically creates a shared network for all declared services, enabling containers to reference each other by service name without manual network configuration. A key limitation of the depends_on directive is that it controls container start order but does not guarantee a service is ready to accept connections, which can cause failures during initialization. To handle true readiness, Compose supports healthcheck conditions that delay dependent services until a target container passes a defined health test. Sensitive configuration such as database passwords and API keys can be kept out of the compose.yaml file by storing them in a separate .env file, which Compose reads automatically.