How do you define environment variables in a Docker Compose file?

Описание: Yes, we can use environment variables in a Docker Compose file. Each service in the Compose file typically corresponds to one container, though we can specify multiple replicas if needed. Within each service block, we define attributes like the image, volumes, ports, dependencies, and also environment variables using the environment key. This is structured as a YAML array, where each entry is a key-value pair formatted as KEY: value. For example, the frontend service may use environment variables to know the backend's host and API endpoint, while the backend typically receives database connection details—such as the DB host, name, username, and password—via its own environment block. These variables are injected into the containers when the services start up, ensuring proper configuration and communication between components.

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