Software testing is necessary to guarantee quality since it detects defects, bugs, and inconsistencies in software prior to deployment. It confirms that the software adheres to requirements and performs as expected, thus improving reliability and performance. Through early detection of problems during development, testing saves on the cost and effort of correcting problems afterwards. It maintains compatibility on various platforms, devices, and operating systems, supporting a smooth user experience. Additionally, testing protects security by revealing vulnerabilities that may be used by attackers. It also improves customer satisfaction through the guarantee of software stability, usability, and efficiency. Successful testing enables continuous improvement, increases user confidence, and defends the organization's reputation. Moreover, it offers useful feedback to developers, which helps them improve the software. Essentially, software testing is an important quality assurance process that guarantees that software products are secure, reliable, and in line with the user's expectations.

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