The article explores the concept of parameterization in TestNG, a popular test automation framework for Selenium, highlighting its significance in managing multiple test scenarios without the need to hardcode values. It emphasizes the efficiency achieved by using parameterization for executing tests across different browser and operating system combinations. The text explains two primary methods of parameterization in TestNG: using the @Parameters annotation alongside a TestNG XML file, and employing the @DataProvider annotation for data-driven testing. The article provides examples illustrating each method and discusses how parameterization facilitates automated browser testing and integration with online Selenium Grids like LambdaTest. Additionally, it covers advanced features such as the use of Method and ITestContext parameters within Data Providers, underscoring the flexibility and power of TestNG in enhancing test automation processes.