after Complition of developmentprocess.testing team validate
 the application Build  w.r.t Cutomer requirement is called 
Black box Testing.

Basicaly it is a type of testing, either functional or non-
functional, without reference to the internal structure of 
the component or system.

BBT is nothing but the funtionality testing which is done 
by the testing team only and they will not interfere in 
the  internal stucture of the application.  Like code 
tesitng etc..

Blackbox testing is  the functional or nonfunctional 
testing of the application without any knowledge about the 
code.

Blackbox testing contains both Functional and Non-functional
testing .

Functional testing contains the validity and non-validity of
the application.
Non-Functional testing contains the look and feel of the
application.

Blackbox testers will not have any knowledge about the
internal structure of the application.

black box testing is a concept which is used to testing the
software as a overview.
*giving input
*getting output
*there is no idea about internal workings

Also known as functional testing. Asoftware 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

Black box testing - not based on any knowledge of internal 
design or code. Tests are based on requirements and 
functionality.

It is the outer structure of testing without going indepth  
functionality

functional testing, without requirements also we can do 
black bix testing.

Black box testing is the testing the application with out 
knowing the internal structure of the application.

In Black box testing we will functional non functional 
testing including security testing also.