Selenium helps reduce the number of test runs by automating repetitive and time-consuming test cases, allowing testers to focus on more critical aspects of the application. By enabling automated regression testing, Selenium quickly verifies that existing functionalities are unaffected by new changes, reducing the need for extensive manual testing. Selenium's support for parallel test execution across multiple browsers and environments further accelerates the testing process, allowing multiple tests to run simultaneously. This parallelization minimizes the overall test execution time, making the entire process more efficient. Additionally, Selenium integrates seamlessly with Continuous Integration (CI) tools, enabling automated test runs whenever code changes are made. This continuous testing approach helps catch defects early, ensuring a more stable and reliable product while significantly reducing the manual effort and the number of test runs required.