Can you explain to me what is meant by the term Business Case in Prince2?

I am struggling to find this on the web.

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Business Case is information that describes the justification for setting up and continuing a PRINCE2 project. It provides the reasons (and answers the question:‘Why?’) for the project. An outline Business Case should be in the Project Mandate.Its existence is checked as part of the Project Brief,and a revised,fuller version appears in the Project Initiation Document.It is updated at key points, such as end stage assessments, throughout the project.