Bug: A fault or defect in a system or machine and identified by the tester.
Defect: Whenever the project is received for the analysis phase, may be some requirement miss to get or understand most of the time Defect itself comes with the project (when it comes).
Issue: Client site error most of the time. An issue is a major problem that will impede the progress of the project and cannot be resolved by the project manager and project team without outside help.
Error: When anything is happened wrong in the project from the development side i.e. called as the error. Error is the deviation of a measurement, observation, or calculation from the truth.
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