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I was asked this question in an interview.
What are functional and non functional parts of an application ?
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Functional Testing like System, Integration, End to End, API testing, etc are done. Non-Functional Testing like Performance, Stress, Usability, Security testing, etc are done. Usually easy to define.
Functional requirements define what a product must do, what its features and functions are. Nonfunctional requirements describe the general properties of a system. They are also known as quality attributes.
Functional parts are those that relate to the function of the application - what it does.
Non functional are the parts that do not directly relate to the function - things like:
For example, in a calculator application, the functional parts are how the input and output work and the calculation logic/operation itself.
Non functional would be the usability, quality, performance and other aspects that do not have direct bearing on the calculator operations.
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Functional relates to the features of the application. i.e. what it does. The non-functional parts are characteristics like:
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