Bug / Defect / Issue — a practical guide to bug defect issue with clear examples you can reuse in real projects.
QA Testing Tutorial Series (22/112). Prefer one article? Read the complete QA testing tutorial.
Short description
In practice teams say “bug”; formally a defect is a deviation from expected behavior/requirements.
Terms
Error → human mistake
Defect/bug → in product
Failure → observed incorrect behavior
Issue → tracked work item