Interview Questions

What is the difference between a bug, a defect, and an error?

Why are there Bugs in Software?

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What is the difference between a bug, a defect, and an error?

an error:
A human action that produces an incorrect result.
Programmatically mistake leads to error.

An informal word describing any of the above.
Deviation from the expected result.
A software bug is an error, flaw, mistake, failure, or fault in a computer program that prevents it from working as intended, or produces an incorrect result. Bugs arise from mistakes and errors, made by people, in either a program's source code or its design. It is said that there are bugs in all useful computer programs, but well-written programs contain relatively few bugs, and these bugs typically do not prevent the program from performing its task. A program that contains a large number of bugs, and/or bugs that seriously interfere with its functionality, is said to be buggy. Reports about bugs in a program are referred to as bug reports, also called PRs (problem reports), trouble reports, CRs (change requests), and so forth.

Problem in algorithm leads to failure.
A defect is for something that normally works, but it has something out-of-spec.

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