A human miskate in the coding is all "Error".
Due to this error in the coding the test engineer find the 
missmatchs is call "Defect".
When this defect is accepcted by the developer it is known 
as "Bug"
The defect is some time is also call as "Issue".



 

Regards,

Priyanka Tambad,

Software Engineer,

JAMS Technologies PVT.LTD.