Why Jmeter opens with a Console(command prompt) in background?

I've searched through internet and couldn't find an explanation for this question, So posting in SO for a better understanding.

When i open Jmeter.bat the it opens jmeter GUI along with a DOS window in background. What is the need for this window?

If this window is to check the initial start-up errors, why is it still open after the GUI loaded.

Why shouldn't we use ApacheJmeter.jar instead of jmeter.bat for opening jmeter?

Thanks.