Real-Time Example: Defect vs Bug

Example 1: Internet Banking Application

Requirement: User should be able to transfer up to ₹1,00,000 per day.

Actual Implementation: The application allows transfers up to ₹10,00,000 per day.

Defect: The code does not comply with the business requirement.

Bug: QA tests a ₹5,00,000 transfer, observes it succeeds, and logs a bug in Jira.

Interview Statement: "The incorrect implementation is the defect. Once the tester discovers and reports it, it becomes a bug."

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Example 2: Healthcare Application

Requirement: Patient date of birth must not be a future date.

Actual Behavior: System accepts a future date such as 01-Jan-2030.

Defect: Validation logic is missing.

Bug: Tester enters a future date and reports the issue.

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Example 3: E-Commerce Website

Requirement: Apply 10% discount on orders above ₹5,000.

Actual Behavior: System applies only 5% discount.

Defect: Discount calculation logic is incorrect.

Bug: Customer or tester notices the wrong discount and raises a bug ticket.

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Project Manager / Delivery Manager Interview Answer

"A defect is a flaw in the design, code, or requirement implementation. When the defect is identified during testing or by a customer and logged for resolution, it is referred to as a bug. For example, if a banking application allows transactions beyond the approved limit, the incorrect code is the defect, and the issue reported by QA is the bug."

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