Software testing is a crucial process that assesses the quality of software and reduces the risk of software failure in operation. It involves various activities, including test planning, analyzing, designing, implementing tests, reporting test progress and results, and evaluating the quality of a test object. Software testing can be categorized into different types, such as functional testing, non-functional testing, unit testing, integration testing, system testing, acceptance testing, user acceptance testing (UAT), alpha testing, beta testing, exploratory testing, regression testing, and more. The objectives of software testing include preventing defects, verifying requirements, checking the completeness and functionality of a test object, building confidence in its quality, finding defects and failures to reduce the risk of inadequate software quality, providing information to stakeholders, and complying with contractual, legal, or regulatory requirements or standards. Quality assurance (QA) is related to testing but not the same, as it includes all activities that direct and control an organization about quality, while testing is a specific process that supports the achievement of appropriate levels of quality. Software development and software testing are closely linked, with each development activity having a corresponding test activity, and test levels such as unit testing, integration testing, system testing, and acceptance testing being used to verify different aspects of software quality.