Which of the following best describes Load Testing?

Load Testing is best described as the process of testing an application under heavy load conditions. This type of testing is intended to evaluate the performance and behavior of the application when subjected to a significant amount of user activity or data processing. The goal is to ensure that the application can handle expected levels of usage without performance degradation.

In load testing, various metrics are often monitored, including response times, throughput, and resource utilization, to identify how the system behaves under stress. This helps in determining the application's reliability and scalability, ensuring that it can accommodate actual user load scenarios effectively.

The other definitions do not accurately capture the essence of load testing. For instance, testing under normal conditions focuses on routine usage, which is not the primary concern of load testing, as it measures performance under stress rather than standard scenarios. Maximum capacity testing, while related, specifically looks at the upper limits the system can handle, which can differ from typical load conditions that reflect everyday use. Testing across various devices addresses compatibility rather than performance under load. Thus, "testing the application under heavy load conditions" is the most fitting description for load testing.