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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →In software testing, “bug” and “defect” usually mean the same underlying flaw. Defect is the more formal, standards-oriented term; bug is common in everyday developer conversation. The more important distinction is between a human error, a defect in a work product, and a failure that may happen when the defect is activated.
Bug vs. defect: the short answer
There is no universal technical rule that bugs are code-only while defects include requirements or other artifacts. The ISTQB groups bugs with defects and faults in its testing terminology. Its current glossary defines a defect as “An imperfection or deficiency in a work product where it does not meet its requirements or specifications or impairs its intended use.” (ISTQB Glossary, “defect,” Version 3.)
In practice, choose the word your team uses in conversation or its tracking workflow. When precision matters, describe the flaw and its consequences rather than relying on the label alone.
How errors, defects, and failures differ
These terms describe different concepts in a cause-and-effect model, not three interchangeable names for the same event. ISTQB CTFL Foundation v4.0 material puts it this way: “Human beings make errors (mistakes), which produce defects (faults, bugs), which in turn may result in failures.”
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- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
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| Term | What it means | How it relates to the others |
|---|---|---|
| Error | A human action or mistake. | May introduce a defect. |
| Defect or bug | A flaw in a work product. | May cause a failure when activated. |
| Failure | Observable behavior during execution that does not meet requirements. | May result from a defect, but environmental conditions can also cause failures. |
A defect does not always produce an observed failure. It may fail whenever the relevant code runs, fail only under certain conditions, or never cause a failure in practice. A failure is the visible outcome; the defect is the underlying flaw.
One example from requirement to user impact
Suppose a developer misunderstands a date requirement and writes a validator that rejects a date the system should accept. The misunderstanding is the human error; the faulty validator is the defect or bug; a user who is rejected when entering that date experiences a failure.
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- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
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The requirement itself could also contain a defect—for example, if it contradicts the intended behavior. Defects can exist in requirements and specifications as well as code, tests, documentation, builds, and other supporting work products.
What to call an issue in a team or report
“Bug report” and “defect report” are overlapping, established terms. ISTQB glossary material also uses terms such as “bug tracking tool” and “bug report.” The glossary lineage supports their overlap; it does not establish a single naming convention that every organization must follow.
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- Use the label your team’s tracker and workflow expect.
- Describe the expected behavior and the observed behavior separately.
- Include the conditions that reproduce the issue, since a defect may cause a failure only in particular circumstances.
- Identify the affected work product when it is known; the flaw may be in a requirement, test, document, or build rather than in application code.
For standards context, ISTQB describes its glossary as a shared terminology resource for the testing community. IEEE/ISO/IEC 24765-2017 is a broader systems and software engineering vocabulary standard; its catalog notes that definitions can be traced to active source standards.
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- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
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- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
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