Black Box Testing

Black Box Testing is one of the most commonly used and important methods for verifying software quality. This approach focuses solely on the inputs and outputs of a system, without considering how the system works internally. In other words, the tester evaluates the software from the perspective of the end user.

Imagine a mobile app for ordering food. As a tester, you have no knowledge of how individual functions are programmed. You can’t see the database or understand the pricing logic. You don’t know how authentication works. Your job is to test various input combinations (e.g., entering an incorrect password, attempting payment with an invalid card, ordering food without providing an address) and observe how the application responds.