Testing the application to check whether it fails where it 
should fail with invalid inputs and out of bound scenarios.

Negative testing 
validating the appln , in order to ensure the qulaity of 
the product with invalid data

negative testing is nothing but testing the application 
with invalid inputs and unespected conditions

In testing ,tester first approaches the valid conditions 
and all valid inputs. But when after the Valid Approach he 
turns through on Invalid Approach,like if there is a site  
tester test that where this site fails ,all the steps taken 
by him to make that site fail is called the Negative 
Testing.

Hi,

    Nagative Testing:

        Take an example suppose ur in ur Login screen u 
have username and Pwd text fields are availabel .The 
requirement says that suppose if u enter any invalid value 
in user name field , the system should display an error 
message as "Enter value is invalid".
 we are inputing the negative values and we are checking 
that the error is getting displayed or not...


let me know if it is wrong..


Regards,
Satya.k

negative testing means tesing the application with negative 
or wrong test data to ckeck the behaviour of the 
application.

I thought all the while that is negative testing but read 
this : 
http://www.sqatester.com/methodology/PositiveandNegativeTest
ing.htm
I am getting confuse as how to define negative test cases 
now.
Anyone care to give me more lights for this?
Thanks.

Negative testing is nothing but the testing with invalid data.
when we do adhoc testing at that time it is more useful.
In adhoc testing user dont know what is valid or
invalid.During such adhoc testing  system should not
crash.For this purpose negative testing is done.

clear me if i m wrong.

Testing the application with the intention of finding the 
defects only...