Which testing type is focused on the entire application performance under high traffic?

Load testing is specifically designed to evaluate how an entire application performs under conditions of high traffic or increased workload. This type of testing simulates multiple users accessing the application simultaneously to assess its responsiveness, stability, and overall performance when subjected to large volumes of requests. The insights gained from load testing help identify potential bottlenecks or system failures that could occur during peak usage times, allowing developers to optimize performance and ensure a smooth user experience.

In contrast, smoke testing is a preliminary check to see if the major functions of an application are working after a new build or update, but it does not analyze performance under load. Functional testing focuses on ensuring that specific functionalities of the application work as expected, without assessing the performance aspects. Unit testing examines individual components or functions of the application in isolation, and thus will not reveal how the complete system behaves under high traffic conditions.