White Box Testing White box testing (a.k.a. clear box 
testing, glass box testing or structural testing) uses an 
internal perspective of the system to design test cases 
based on internal structure. It requires programming skills 
to identify all paths through the software. The tester 
chooses test case inputs to exercise paths through the code 
and determines the appropriate outputs. In electrical 
hardware, testing every node in a circuit may be probed and 
measured; an example is in-circuit testing (ICT).

 Black Box Testing alao known as functional testing. 
software testing technique whereby the internal workings of 
the item being tested are not known by the tester. For 
example, in a black box test on a software design the 
tester only knows the inputs and what the expected outcomes 
should be and not how the program arrives at those outputs. 
The tester does not ever examine the programming code and 
does not need any further knowledge of the program other 
than its specifications.

White box testing is the testing of internal structure of 
s/w. It requires knowledge of coding. It is also known as 
structural or glass box testing. Tests are based on the 
coverage of code statements, branches, path conditions etc.

Black box testing is the testing of functionality of a 
software. It does not need knowledge of coding. It is also 
called functionality/opaque testing. Tests are based on the 
requirements and functionality.

black box testing is a one type of testing.it performs 
only  testing on  the functional part of the application 
with out knowing the stsuctural part of the application.

white box testing is a one type of the testing.it performs 
testing on the structural part of the application.

white box testing is design of test cases using structure of
code. block box testing is design of test cases using
specification.