The Confusion: Error vs. Fault vs. Bug vs. Defect vs. Failure

Most of these terms — error, defect, fault, failure, and bugs — are interchangeable, although there are differences. In short- “A mistake in coding is called an Error, an error found by a tester is called a Defect, a defect accepted by the development team then is called Bug, the build does not meet the requirements, then it Is Failure.”

Error:

The problem in code leads to errors, which means that a mistake can occur due to the developer’s coding error as the developer misunderstood the requirement or the requirement was not defined correctly. For example, a developer may misunderstand a design notation, or a programmer might mistype a variable name — leading to an Error. It is the one that is generated because of the wrong login, loop, or syntax. The error typically arises in software; it leads to a change in the program’s functionality.

Fault:

A fault is introduced into the software as the result of an error. An anomaly in the software may cause it to behave incorrectly and not according to its specification. A fault may happen in a program because of the following reasons:

• Lack of resources
• An invalid step
• Inappropriate data definition