error,defect,and a bug............

In computer world, A defect is more of the imperfection of a hardware, maybe a manufacturing defect or a worn out components, misalign parts, it is more of a physical thing. A bug is more of a flaws in software or programs, a mis calculated programming coding, syntax error or misspelled command or command usage. Finally an Error is the byproduct of this two - defects and bugs. These are the systems way or telling user that something went wrong that needs their attention, the feed back mechanism of a the system.