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This is a TestNG tutorial, where I will help you realize the different TestNG listeners with examples so you could use them proficiently the next time you plan to work with TestNG and Selenium. TestNG Listeners in Selenium WebDriver are modules that listen to certain events and keep track of test execution while performing some action at every stage of TestNG behaviour. The most popular & widely used TestNG listener is ITestListener, which is the most adopted. It also defines a new way of logging or reporting.