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A software bug is a fault in a computer program that causes it to produce an incorrect or unexpected result, or to behave in unintended ways.

Continuous Integration, Continuous Delivery, and Continuous Deployment.

An information-security vulnerability or a critical bug, where the user's computer integrity can be compromized.

Missing, incomplete, or erratic documentation or code description.

A specific and tangible proposal for added functionality, supported by facts.

Code refactoring is the process of restructuring existing computer code—changing the factoring—without changing its external behavior. Refactoring is intended to improve nonfunctional attributes of the software.

User interface and experience design.

Internationalization (i18n) and localization (l10n) are means of adapting computer software to different languages, regional peculiarities and technical requirements of a target locale.