Ideally, in a Sap environment, a three-system landscape exists. A system landscape consists of
Development Server (Dev),
Quality Assurance server (QAS) and
Production Server (PROD)
Development Server (Dev): In development server you have to make configuration of SAP + Unit testing also the configurations & coding done here.
Quality Server: In Quality server you have to do again some configuration+ Unit / Integration testing moreover
Production Server: Day to day Transactions posting / SAP End users activities.

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