What are the regular annotations in TestNG and their purposes?

TestNG provides a wide range of annotations that can be used to define and configure test methods, test suites, and other testing-related settings. Here are some of the most commonly used annotations in TestNG and their purposes:

1. @Test: This annotation is used to mark a method as a test method. TestNG will execute all methods annotated with @Test.

2. @BeforeTest: This annotation is used to mark a method that should be executed before any test method belonging to the test class.

3. @AfterTest: This annotation is used to mark a method that should be executed after all test methods belonging to the test class have run.

4. @BeforeMethod: This annotation is used to mark a method that should be executed before each test method.

5. @AfterMethod: This annotation is used to mark a method that should be executed after each test method.

6. @DataProvider: This annotation is used to mark a method that provides test data to a test method. The method must return a two-dimensional array of objects, where each row represents a set of test data, and the columns represent the parameters for the test method.

7. @Parameters: This annotation is used to pass parameters to a test method. The parameters are defined in an XML file or in a separate Java class, and the @Parameters annotation is used to indicate which parameter values should be used for each test method.

8. @BeforeClass: This annotation is used to mark a method that should be executed before the first test method in the test class.

9. @AfterClass: This annotation is used to mark a method that should be executed after all test methods in the test class have run.

These annotations provide a powerful and flexible way to define and configure test methods, test suites, and other testing-related settings, and to customize the behavior of the TestNG framework to meet the needs of different projects and testing scenarios.