Is the back end needed only to produce RESTful API?

I've just started learning Django and from the first tutorials i've followed or test i've done, it seemed to me (note: i'm a beginner at the whole web developing thing) that you can use it to do anything (back end as well as front end). Now thinking about the many frameworks and libraries for the front end I thought that I was missing something, so after a bit of research i came to the conclusion that the back end part is there only to provide a rest service to use with a front end framework. Do anyone for example uses the templates in Django, if so for what purposes? Am I missing something about front end - back end integration?

Thanks.