In this Software Testing Tutorial, we will learn about difference between defect bug error failure in software testing. There is very minor difference between defects and bug but in the actual scenario we will use bug and defects interchangeably.

A deviation is categorized as bug only if the failure is because of the coding error but if it is related to requirements like missing requirements or misunderstood requirement and the actual outcome is not as per expectation because of the requirement issues then that is known as defect.