Bug

An error or flaw in an app that causes malfunctions or undesired results. Bugs, sometimes also referred to as issues or defects, are any sort of unintended behavior in your mobile app. You know you’re working with a proven team of developers when your bug-fixing (the process of elimination of said defects) includes mostly change requests (a call for an adjustment of the system, so it fits your needs better) and code reviews (systematic examinations of code done by the developers to find and eliminate vulnerabilities overlooked in the initial development).