Which annotation is used in TestNG for defining test groups?

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The annotation used in TestNG to define test groups is the @Test annotation. When you specify a group in the @Test annotation, it allows you to categorize tests into different groups based on functionality, feature, or any other criteria deemed relevant for the testing process. This categorization is particularly useful for organizing tests in a more manageable way and for executing specific groups of tests selectively. By using the group functionality, testers can run only a subset of tests that belong to a particular group without affecting other tests, enhancing efficiency in test execution and maintenance.

The other annotations listed serve different purposes in TestNG. The @BeforeSuite annotation is meant for methods that should run before any test methods in a suite are executed, while the @DataProvider annotation is used to provide data to test methods for parameterized tests. The @AfterClass annotation is utilized to define code that should run after all the test methods in a specific class have been executed. Each of these annotations plays an important role in the structure and execution of tests in TestNG but does not relate specifically to defining test groups.