What is Requirement Traceability Matrix (RTM)?

I am not sure if this question is still asked in the interview or not but this is one of the very important concept to understand from the testing point of view.  What is the term RTM? It's Requirement Traceability Matrix. We use RTM to ensure that all functionalities in the app(AUT) are covered. Why do we use RTM? RTM is used to maintain the required coverage so that we can cover all customer/client requirements. We can create this matrix manually in an Excel spreadsheet or by using the tool as well. Generally, we have columns like Requirement ID, Test case ID, status, Remarks, Column etc. We can use Microsoft Test Manager ( MTM) or Team Foundation Server (TFS) tools to create traceability matrix. Mainly, while using RTM, we ensure that each and every requirement is mapped and traced with the respective test case successfuly. We should not miss any requirement while testing hence we map our test case to a requirement. That's the sole purpose of it.

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