Which type of test evaluates how user-friendly the interface and features are?

A usability test is designed specifically to assess how user-friendly an interface and its features are. During such tests, actual users interact with the system or product to perform specific tasks, allowing evaluators to gather insights into how intuitive and easy the application is to use. This type of testing focuses on aspects such as overall user experience, ease of navigation, and the effectiveness of the interface in supporting users in achieving their goals.

In contrast, a load test measures how well a system performs under a specific load, such as the number of users accessing it simultaneously, without focusing on user interaction or ease of use. A performance test evaluates the speed and responsiveness of an application, often under varying conditions, but does not provide information regarding the user-friendliness of the interface. Lastly, a security test is aimed at identifying vulnerabilities and assessing the robustness of the system against potential threats, which is unrelated to usability. Therefore, it is clear that the usability test is the appropriate choice when examining user-friendliness.