Ad hoc testing is a type of unstructured or informal software testing that seeks to interrupt the testing PROCESS in order to uncover POTENTIAL defects or errors as soon as feasible. Ad hoc testing is a type of testing that is done at random and is usually an unplanned activity that does not use any documentation or test DESIGN methodologies to construct test cases. 

Ad-hoc testing is done on any portion of the application at random and does not follow any standardized testing procedures. The primary goal of this testing is to detect PROBLEMS through random inspection. ERROR Guessing, a software testing approach, can be used to perform ad hoc testing. People with adequate familiarity with the system can "predict" the most likely source of errors, which is known as error guessing. This testing does not necessitate any paperwork, planning, or procedure. Because this testing seeks to detect faults through a random technique, defects will not be mapped to test cases if there is no documentation. This means that reproducing errors can be difficult at times because there are no test processes or requirements associated with them.