Test automation using Pytest and Selenium WebDriver is an effective approach for ensuring web applications operate seamlessly across various devices, browsers, and operating systems. Selenium, a popular open-source framework, facilitates automation testing on multiple browsers like Chrome, Firefox, and Edge. Its WebDriver interface acts as a bridge between test scripts and browsers, supporting languages such as Python and Java. Pytest, more advanced than Python's unittest, offers benefits like easy integration with existing test suites, compatibility with other frameworks, detailed failure information, and support for fixtures and xdist for parallel testing. Fixtures, a crucial feature in Pytest, enable the setup and teardown of resources, reducing repetitive code and optimizing test performance. The combination of Pytest and Selenium allows for scalable, maintainable test implementations, which can be further enhanced through LambdaTest's cloud-based cross-browser testing capabilities, enabling comprehensive testing across a wide range of environments without the need for extensive local infrastructure.