Spit out by the AI word wizard! 'A Docker image is a file, comprised of multiple layers, used to execute code in a Docker container. Docker images are used to create containers and ensure that the same environment is used for development, testing, and production. A Docker image includes all the instructions needed to run an application, including the code, runtime, libraries, environment variables, and configuration files. In this case, the Docker image is named fastapi-docker and is built from the instructions in the Dockerfile. It is then used'