First off sorry for the noob question, I'm sure it's been asked before but I have no idea how to phrase it eloquently...

Sometimes when I open/run/execute (unsure of proper term) an application (?lol) from the terminal like geany ie:

geany filename.php

or maybe run a node.js script:

node server.js

The command will execute fine, but I'm then left without the ability to execute any other commands unless I open another terminal. my root@pcname:~$ is gone and when I try typing in something else and hitting Enter it just breaks to the next line.

I've noticed that sometimes I can hit CTRL+D and it'll give me my prompt back (sorry is prompt even the right name for it?)

So could someone please explain why this is happening and how I can get back to the prompt without opening another terminal.

Thanks, and sorry again for my noobery.