grey box testing is nothing but it is a combination of 
Techniques of black box testing and Techniques of white box 
testing.
               or
it is a method of testing in which one can perform testing 
basically the functionality of an application but it 
internal structural knowledge(programming or design or 
environmental knowledge)

combination of whitebox and blackbox testing is called 
Greybox testing
 hi,this is satya ,Any doubts pls contact:991212418320

Hai 
   Combination of white box and block box testing is called
grey box testing

Gray box testing is nothing but combination of White-box 
and Black box testing.

Thanks

Yes Grey box is nothing but combination of white box and
black box technique.

 When we are using a technique that uses code along with
functional testing is called Grey box.

 The methodology that comes under grey box testing is
Integration testing.

    for integration testing we need top down approach and
bottom up approach for example if we like to test each and
individual module we need to go from parent node to child
node.  here if the middle node is not working the developers
write some small peace of code that connects the application
from upper parent node to lower child node. Here if we take
this as scenario we are testing the application ( functional
testing ) and at the same time we are testing the small
peace of code written by developer( white box testing).

 SO for this approach we are doing both black box and white
box testing which is nothing but grey box testing.

grey box testing is nothing but it is a combination of 
Techniques of black box testing and Techniques of white box 
testing.
               or
it is a method of testing in which one can perform testing 
basically the functionality of an application but it 
internal structural knowledge(programming or design or 
environmental knowledge)