Automation testing is a critical component in the software development lifecycle, designed to replace repetitive and error-prone manual tasks with automated scripts, thus improving the performance and efficiency of software testing. While manual testing remains important for harnessing human expertise, automation testing is essential for achieving better test coverage quickly and is particularly suited for repetitive tests such as regression, complex calculations, smoke, data-driven, and performance tests. The tutorial highlights the need for a balanced approach combining both manual and automation testing to maximize software quality, and outlines various automation testing methods, including code-driven, graphical user interface, and framework approaches. Popular automation frameworks like Selenium, Cypress, TestNG, and others are discussed in the context of their application in different testing scenarios, with an example provided using Selenium and LambdaTest for cross-browser testing. Ultimately, investing in automation testing is crucial for maintaining software development efficiency and ensuring high-quality outcomes.