JMeter offers the ability to simulate a number of users sending various HTTP/HTTPS requests to a server application.
Apache JMeter is not limited to HTTP/HTTPS, it supports other protocols like FTP, SMTP, and much more.
JMeter adds load to a server in order to analyse the overall behaviour of the system under test.
You should be familiar with the order of execution for elements inside a Apache JMeter script file.
LoadFocus is a cloud performance, load and stress testing tool which provides the infrastructure to run tests with thousands of concurrent users, from multiple cloud locations, in less than a few minutes, keep history of the results, compare different runs to inspect performance improvements or performance degradation. It also supports running JMeter load tests from the cloud.