What is the difference between bug and defect?

Answer Posted / denny li

"bug" is just a general and informal word for any error or
defect. But we have to talk about some other terms -
"error" and "fault" if we want to know "defect"...
"error" is formal term in software development/testing
which refers to the fault discovered in the same phase
where it is introduced. "defect" is formal term in software
development/testing which refers to the fault discovered
after the phase where it is introduced. "fault" consists
of "error" and "defect".

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