It is a method to test the functionality of software application without considering its internal structure or coding. In this, a tester considers a set of input values and uses them for input into software application. Then he checks generated outputs whether they are the same as expected. Tester may not know about programming code and further even not need program's knowledge.
In black box, testing method of Tester can be non-technical. Test cases are written from perspective of a user. In this, different approaches are perceived like Boundary based value Analysis, Value type analysis etc.
In boundary value analysis, one puts the possible limitations for a value of a field as required. Value type analysis defines which type of value is needed. Error guessing is one more technique which becomes very valuable as experience gained by one. Experienced tester may think of different situations in which application has to be tested
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