The main difference between a test scenario vs test case lies in their level of detail and scope. A test scenario is a broad, high-level description of a particular situation or condition to be tested, outlining the purpose, inputs, expected outcomes, and context of the test. It provides a conceptual overview of what needs to be tested. In contrast, a test case is a detailed set of instructions that specifies how to execute a specific test scenario. It includes precise steps, inputs, actions, and expected results for validating a particular aspect or condition within the scenario. Test cases are more granular and specific, serving as a detailed roadmap for testers to follow during testing. While test scenarios provide a conceptual framework for testing activities, test cases offer the detailed guidance needed to execute those activities effectively.