What is the definition of a defect in software testing?

A defect in software testing is defined as a flaw or imperfection that results in incorrect functionality of the software. This can manifest in various ways, such as wrong outcomes, system crashes, or failure to meet specified requirements. Identifying defects is a crucial part of the testing process, as it allows teams to improve the software's quality by addressing these issues before the product is released to users.

In contrast, a successful software deployment refers to the process completing without issues, which does not define a defect. Similarly, an enhancement feature implies an addition or improvement to the software, rather than a flaw or error. A required system update suggests maintenance or upgrades to existing software, which does not pertain to the notion of a defect in functionality. Therefore, understanding a defect as a flaw leading to incorrect functionality is essential for effective software testing and quality assurance.