WebDriverWait is important in Selenium automation testing as it helps manage timing issues and ensure that test scripts wait for specific conditions to be met before proceeding. This is crucial for handling dynamic web elements, asynchronous behavior, and page loading times, which can vary across different web applications and environments. By using WebDriverWait, testers can avoid common issues such as NoSuchElementException or StaleElementReferenceException, which occur when trying to interact with elements that are not yet present or have become stale. Additionally, WebDriverWait improves the reliability and stability of test scripts by providing a flexible and efficient way to wait for elements to become available, ensuring more accurate and consistent test results. Overall, WebDriverWait enhances the effectiveness of Selenium automation testing by allowing testers to write more robust and resilient test scripts that can handle various timing scenarios encountered during test execution.