Final answer:
Black box testing focuses on software functionality without considering internal workings, while glass box testing requires knowledge of the software's internal structures to design test cases that ensure all paths are tested.
Step-by-step explanation:
The difference between black box testing and glass box testing also known as white box testing is primarily in their approach and focus. Black box testing is a method where testers evaluate the functionality of the software without peering into its internal structures or workings.
They test the software by providing inputs and examining the outputs without knowing how the application processes the inputs. Testers treat the software as a "black box" because they are not concerned with the internal behavior, only the outcomes.
In contrast, glass box testing involves a more thorough approach where testers require knowledge of the internal workings of the software. Testers examine the program's structure, its source code, and control flow among other details.
They design test cases based on internal paths and structures to ensure all the paths within the application are tested. It is called "glass box" testing because everything is visible to the tester.
Black box testing is generally used for validation and verification of the software's functionality, while glass box testing is used for a deeper inspection, which includes testing specific aspects of the code's logic and design.