After the Bug fixed ,testing the application whether the
fixed bug is affecting remaining functionality of the 
application or not.
Majorly in regression testing Bug fixed module and it's 
connected modules are checked for thier integrity after bug 
fixation.

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Hi,

   Regression Testing:
   
         After getting confirmation the bug is fixed we are 
going to check the fixation is going to create any problems 
in the application or not.


Regards,
Satya.k

The re-execution of selected tests on the modified build to
estimate the completeness and correctness of that
modifications is called Regression Build.

Regression Test will make sure theat one fix dose not 
create some other problems it or in any other inrerface.
So Set of related test case may have to repeat again
ro make sure that nothing else is affected by the particular
fix.


Vinod Anandhan
Software Tester
Exceed Technologies
Chennai

It is the process of evaluating whether the fixed bug 
caused any uninteded effects on the existing functionalities

One wiil perform testing on the all ready testing functionality

It is a type of testing in which one will perform testing on
the already tested functionality ones again.It is usually
done by two scenarios 
When ever the test engineer raises a defect developer
rectifies it next build is released to the testing
department         
then the test engineer will test the rectified functionality
as well as related functionality ones again in order to
ensure while rectifying the defect the related functionality
is not effected.
when ever the new changes are proposed by the customer
incorporated by the developer and the build is released to
the testing department then the test engineer will test the
already tested related functionality ones again in order to
ensure that the old functionality remains same despite of
new changes

Repetition of testing.
Retesting after fixes or modification of the software or it
environment.
Compare new output with olderone

Regresssion testing is nothing but fixing bugs should not 
effected the existed functionality.

The selective retesting of a software system that has been 
modified to ensure that any bugs have been fixed and that 
no other previously working functions have failed as a 
result of the reparation and that newly added features have 
not created problems with previous versions of the software.