Black Box Testing is a software testing method where the tester evaluates the functionality of an application without knowing its internal code or structure. The focus is on input and output, ensuring that the software behaves as expected based on specified requirements. Testers create test cases based on user scenarios and requirements, checking if the application meets its intended purpose. This approach is beneficial for identifying issues related to user experience and functionality. It allows testers to simulate real-world usage, ensuring that the software performs correctly under various conditions. Black Box Testing is commonly used in system testing and acceptance testing.