Negative testing is simply testing with invalid data, just
to check applications behavior with unexpected inputs.

for example:
If you have to validate "Age" field, your test data should
be numerals between 0 to 200 (I think I expect more :))
But you attempt to validate this field with alphabets OR
special characters it will become negative test data for
negative testing.

Regards,
Rupesh
+919225513854