The article delves into the use of parameterized tests in NUnit, a widely used C# test framework compatible with Selenium, to enhance cross-browser testing efficiency. It emphasizes that parameterized testing reduces code duplication when executing tests on various browser and OS combinations, facilitating more streamlined and manageable testing processes. The piece outlines different NUnit attributes, such as TestCase, TestCaseSource, and ValueSource, which allow for diverse input parameters in test methods, thereby enriching the testing scope. Furthermore, it discusses the importance of utilizing cloud-based platforms like LambdaTest for expanded browser coverage, as opposed to relying solely on local Selenium grids, which are less scalable. The article also provides examples of applying these NUnit attributes in practical scenarios, highlighting the benefits they bring in terms of parallel execution and resource optimization.