The Apache JMeter, popularly known as the JMeter, is open-source software. The software is a 100% pure Java application developed to load testing functional behavior and measuring performance.

JMeter was initially developed to test applications, but it has expanded to several other test functions with several advancements. It is used to execute performance testing, functional testing, and load testing. The software is used to simulate a significant amount of load on a server or a group of servers to test the strength and analyze the strength under different load types.