JMeter

JMeter is an open-source software tool designed for performance testing and analysis of web applications. It simulates multiple users accessing a website or application simultaneously, allowing developers to measure how the system performs under stress. By gathering data on response times, throughput, and error rates, JMeter helps identify potential bottlenecks and issues before a site goes live or during updates. It can test not only websites but also various services like APIs, making it a valuable tool for ensuring that applications can handle high traffic while providing a good user experience.