There are different interfaces provided by Java that allow you to modify TestNG behavior. These interfaces are further known as TestNG Listeners in Selenium WebDriver. TestNG Listeners also allow you to customize the tests logs or report according to your project requirements. 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 test execution.
This is a TestNG tutorial, where I will help you realize the different TestNG listeners with examples so you can use them proficiently the next time you plan to work with TestNG and Selenium.