Functional testing is concerned about business specifications, non-functional testing is meant to decide if your product will give a good user response. For example, non-functional tests are used to define how fast the product reacts to a request or how long it takes to do an action.
Functional testing is concerned only with the functional requirements of the system or subsystem and covers how well the system executes its functions. These include any computer user orders, data manipulation, searches and business process
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