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TestNG is a testing framework inspired by JUnit and NUnit, designed to simplify the testing process. It supports a wide range of testing types such as unit tests, functional tests, end-to-end tests, and integration tests. One of its key features is its ability to run tests in parallel, significantly speeding up the test execution process. TestNG also provides advanced annotations for test configuration and better dependency management of test methods, making it more flexible than many traditional test frameworks.

TestNG is ideal for both developers and testers, offering a simple development and reporting structure. It integrates seamlessly with popular build tools like Maven and Gradle, facilitating continuous integration workflows. Besides, it supports data-driven tests, enabling users to run the same test with multiple sets of data, which is crucial for thorough application validation. With robust documentation and a supportive community, TestNG is a popular choice among DevOps teams looking to ensure code quality efficiently. Best of all, TestNG is open-source and free to use, which makes it accessible for teams of all sizes.