TestNG is a testing framework which gives the developer the ability to write more flexible and powerful tests with the help of easy annotations, grouping, sequencing & parameterising the concept of TestNG is taken from JUnit and NUnit with more functionality added to make execution more efficient and powerful. TestNG is an open source automated testing framework. Which is more similar to JUnit but it is much more powerful than JUnit. When TestNG releases it has eliminated most of the limitations of the older framework and. You can go through the Intellipaat Selenium tutorial to learn TestNG also if you want to have a certificate in it then you can have a look at the following Selenium training course. If you want to watch the video tutorials of it then you can have a look at the following video tutorial.