Rhetasdin

I've been reading online that scripting languages are used separately in applications to make GUI's or other things. Specifically I've been looking at Python because I read I could make a GUI for a C++ program with it. Is this correct? Am I not able to create a GUI with a language like C++? If not, what is the general idea of using two languages for one application? Or if I'm just completely off-track, can someone point me in the right direction? Pure Body Slim