• An error is a misunderstanding or mistake or misconception on the part of the software developer.


  • The result of the error is termed as the fault.

  • It is an anomaly in the software it causes incorrect behavior of the software 

  • It behaves not according to the specifications


  • We can say that a failure is the inability of the software to work in accordance with the software that is mentioned in the SRS document. 

  • Failures and defects we sometimes call bugs