MT - 59 - Difference between white box and Black box testing

This is a basic question asked in many interviews. Lets see the differences in tabular form :

Black Box testing	White Box testing
Black Box testing is a testing method in which we consider the system as a black box, we give input and check the output. Here the tester need not to have the knowledge of internal structure.	White box testing is a testing method in which the tester needs to know the internal structure and design of the system. The system is considered as white box or glass box.
Test Cases are written based on the basis of the requirements.	Test cases are written on the basis of detailed design.
Programming/Coding knowledge is not required	Programming/Coding knowledge is required
Also known as functional testing, it is applicable to higher levels like acceptance and system testing	Also known as structural testing , it is applicable to lower level of testing like unit testing
There is a  separate team of Testers to do Black box testing	Usually Developers are responsible for White box testing
This type of testing always focuses on what is performing/ carried out	This type of testing always focuses on how it is performing/ carried out
External Testing	Internal testing
Code optimization can’t be done and since the testing is not at internal level so hidden errors can’t be caught at code level	Code Optimization can be done and hidden errors can be discovered.
Black box testing techniques are Equivalence partitioning , BVA , Error guessing , CE graphing, etc	White box testing techniques are path testing , branch testing , condition testing , loop testing , etc
Implementation knowledge is not required	Implementation knowledge is required