TestNG Reporter Log is an inbuilt class in TestNG which provides test methods to log messages that will be included in the HTML reports generated by TestNG. It helps in storing logs in the reports that can be either user-generated or system-generated reports. This can be hugely beneficial when we later look at the reports as it helps derive detailed information from the logs. The Reporter Class is one of the simplest ways of generating log information, which is essential for debugging and identifying failures in test cases. By using the Reporter.log() method, developers can log messages that will be included in the HTML reports generated by TestNG, making it easier to track and analyze test results.