What is meant by shell environment variable here?

what is meant by shell environment variable here as we need to explicitly provide an environment variable to a container so this should not even count until we give in variable in environment file why this is given in list and what is the context

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Hi Rajat,
Environment variable and shell variable are two different things. A shell variable is a variable that is generally available to the current shell. But the environment variable is available system-wide and can be used by other applications on the same system.
The shell variable in the list is specified in the lesson to define the priority/ precedence of environment variables when they are used in more than one file. Then that variable will be used which is specified in the current shell.