Apache JMeter is used to test performance static and dynamic resources both (Webservices (SOAP/REST), Web dynamic languages in PHP, Java, ASP.NET, Files, etc... Java Objects, Data Bases Queries, FTP Servers and more other..).
It can be used to simulate a heavy load on any server, group of any servers, any network or any object to test its strength or to analyze overall Load performance under different load types. You can use it to make a graphical analysis chart,Excel report,csv report, of performance or to test your server/script/object behavior under heavy concurrent load.