Automation testing is pivotal in maintaining a robust Continuous Integration and Continuous Deployment (CI/CD) pipeline, as it ensures the rapid and reliable delivery of software updates. The integration of automated testing into CI/CD pipelines supports agile development by enhancing test coverage, reducing manual testing efforts, and facilitating quicker identification and resolution of bugs through shift-left testing practices. While manual testing remains necessary for certain scenarios, automation is crucial for handling repetitive, labor-intensive tasks and ensuring scalability. Tools like Selenium and platforms such as LambdaTest enable cross-browser testing and parallel test execution, accelerating the testing process. Automation testing not only optimizes the CI/CD pipeline by minimizing errors and integration time but also supports version control and rollback capabilities, enhancing overall software quality and delivery speed.