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Broadly, functional requirements define what a system is supposed to do and non-functional requirements define how a system is supposed to be mathematical function, a black box description input, output, process and control functional model or IPO Model.roadly, functional requirements define what a system is supposed to do and non-functional requirements define how a system is supposed to be mathematical function, a black box description input, output, process and control functional model or IPO Model.
Formally taken these are the ones that are respectively called as the Functional and Technical requirements. Functional requirements and uses: These are the ones that say what is expected from a system. They are the ones that get transformed into the UMLs and the UseCases.