Question

how application works? how apps background works?

Answer 1

Let's look at the basic three-step process of the Web application:

 

1. The browser (the client) sends a request to the server (the Web Server) over the network (the Internet or Intranet) in the form of a link on a Web page, a Web address (URL) or an HTML form.

2. The Server runs an application that provides the requested service (data-entry, data-processing, data retrieval).

3. When the application closes, the Server returns some kind of response page back over the wire to the Browser. It may be an updated copy of the same page (a client code lookup would be one example), an error page ("sorry, duplicate name"), a response page ("thank you for your order") or just another blank data-entry form.
There you go, that's a Web application.
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Answer 2

application is a set of program that execute by computer when operator want and give output
as the apps are also prepared written program for a special task.