Bug: The problem getting at the time of testing.
Defect: when we get problem on customer's hand is a defect.

Defect:Tester found a mismatch during testing time is called as defect.
Bug:tester found defect is accepted by tracking team and developer ready to fix
is called as bug

the error found by test engineer is called as defect.
while that defect accepted by developers is called as bug

Bug means it is a coding error.it is fixed by the developer which is posted by the tester.
Where as defect is found by the tester while they are testing the application.

Bug found in the development environment before it is shipped to the customer while defect found in the product after it is shipped to thecustomer

Bug - Bug is a error during program execution.There are 2 bug
1. syntax
2. logical

Defect- A product or service no fulfillment of an requirement.

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