Explain CMD and ENTRYPOINT in a Dockerfile?

In a Dockerfile, both CMD and ENTRYPOINT instructions define which command will be executed while running a container. For their cooperation, there are some rules, such as :
 
* The Dockerfile should specify at least one command from CMD or ENTRYPOINT
* While using the container as an executable, ENTRYPOINT needs to be defined
* When running the container with an alternative argument, CMD will be overridden
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