What type of testing is NOT suitable for automation using Selenium?

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Load testing is primarily focused on assessing the performance and scalability of an application under a particular workload. It examines how the system behaves under different levels of stress or user demand, measuring response times, transaction throughput, and system stability. While Selenium can effectively manage browser automation for functional tests, it is not designed for handling performance benchmarks, concurrent user loads, or simulating stress on servers.

In contrast, regression testing, integration testing, and functional testing often require automated scripts that check application functionalities or workflows against specifications, which is what Selenium excels at. It allows for the effective and efficient validation of web applications during iterative development. However, load testing relies on specialized tools designed for performance testing purposes, making it unsuitable for Selenium.