JMeter is owned by Apache, a project made to use as a load-testing tool. The main purpose of JMeter is to analyze and measure the performance of the software.
It can be used for a variety of services that are mainly focused on web applications. JMeter is open-source and free to use. It is entirely based on Java programming language. It has a GUI feature as well which uses a Swing Graphical API. Much more awaits for you to learn and grow your knowledge so stay tuned.