What characterizes blackbox testing?

Blackbox testing is characterized by an approach that focuses on examining the external behavior of a system without any knowledge of its internal workings or code structures. Testers interact with the system as an end user would, giving them insights into how the system responds to various inputs and conditions. This method allows for an assessment of the system's functionality, usability, and reliability from the perspective of a user, which is crucial for identifying any potential vulnerabilities or issues that could impact user experience.

The focus on external behavior makes this type of testing valuable for validating that the software meets its specified requirements and performs its expected functions. Testers simulate different usage scenarios to ensure that the system behaves as intended under various circumstances without needing to understand the internal code or design logic.

In contrast, the other choices reflect aspects of other testing methodologies. Knowledge of internal code structures pertains to white box testing, which examines the internal workings of an application. Focus on internal system behavior also aligns with white box testing, as it emphasizes understanding the logic behind the application’s processes. The review of system logs and data represents a different approach, often associated with post-event analysis or incident response rather than testing the software in real-time. Thus, the emphasis on observing external behavior distinctly characterizes blackbox testing