It is impossible to manually test enterprise projects that contain millions of lines code. Automated UI testing is essential for software developers to produce quality products. TestNG is the most popular testing framework available. This Introductory course will provide a foundational understanding of TestNG and explain why it is essential for Selenium Automation testing. The course will cover topics such as TestNG annotations and parallel testing, prioritization, test dependency integration, integration, and more. The framework's core functions include creating and executing test scripts, generating reports, writing logs, and reading & writing test results.