Domain Testing is a type of Functional Testing which tests the application by giving inputs and evaluating its appropriate outputs. It is a software testing technique in which the output of a system has to be tested with a minimum number of inputs in such a case to ensure that the system does not accept invalid and out of range input values.
One of the most important White Box Testing methods is domain testing. The main goal of the Domain testing is to check whether the system accepts the input within the acceptable range and delivers the required output. Also, it verifies the system should not accept the inputs, conditions, and indices outside the specified or valid range.
Domain testing is different from domain-specific knowledge you need to test a software system.