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What is JMeter and How its work?
It is a tool for testing and used for analyzing and measuring the performance of different types of software services and the different PRODUCTS. One another important fact is that JMeter is PURE Java open source software which is used for testing Web Application or any of FTP applications. Now comes to which type of testing we usually used JMeter it is used for performacne, Load and functional testing of web applications. And it is also test by putting a heavy load on a server by creating LOTS of virtual concurrent users to the web server.
Now comes how JMeter perform testing below are some steps:-
(1)It create a virtual request and send to the server.
(2)After getting response from server it will collects the response and visualizes those details in a chart or graph.
(3)It also PROCESSES the response from the server.
(4)It have the features like it can product the result in many format such as text, XML and in JSON so the tester can easily analyze the data.

Benefits of JMeter
Below are the many benefits of JMeter
(1)With the HELP of JMeter we will provides a variety of graphical ANALYSES of performance reports.
(2)With the help of JMeter we can DISCOVER maximum number of concurrent USERS that our website can handle.
(3)WIth the help of JMeter we can used to test the performance of both static resources like JavaScript and HTML and we can also test the dynamic resources such as JSP, SERVLETS and the AJAX.

What is role of Timer In Jmeter?
When we use Jmeter THREAD by default it will send REQUEST ONE by one without any PAUSE or we can say continuously send request without pause. And to get pause between all the request we use Timers. And some of the types of timer are give below:-
(1)Constant Timer
(2)GAUSSIAN Random Timer
(3)Synchronizing Timer
(4)Uniform Random Timer