What is the use of setting environment directive in Jenkins?

1.	What is the use of setting environment directive in Jenkins?
Answer» The ENVIRONMENT directive specifies a sequence of key-value pairs which will be defined as environment variables for the all steps, or stage-specific steps, depending on where the environment directive is located within the Pipeline. This directive SUPPORTS a SPECIAL helper method credentials() which can be used to access pre-defined Credentials by their IDENTIFIER in the Jenkins environment.

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