Description: Black box testing is an evaluation method where the tester has no prior knowledge of the internal workings of the application or system being tested. This approach focuses on the input and output of the system, allowing the tester to interact with the application as an end user would. Black box testing is particularly useful for identifying errors in functionality, usability, and security of software applications. By not having access to the source code or internal architecture, the tester is forced to adopt the user’s perspective, which can reveal issues that might go unnoticed in more technical testing. This type of testing is commonly used in software development as well as in penetration testing, where the goal is to assess the security of a system from the viewpoint of a potential attacker. Black box testing is essential to ensure that software meets customer requirements and functions correctly under various conditions, making it an integral part of the software development lifecycle.