Frontend frameworks vs Backend frameworks

As someone just started in web development, I was constantly bothered with these terms and really hoping someone could explain some of my questions for me.

What is the major difference and similarities between frontend frameworks and backend frameworks?

Can I use both in one web project or does they conflict? (Never seen a project that use both front and backend framework).

If one project only need one framework, then why are some named frontend frameworks some named backend frameworks.

Currently I'm more familiar with Django, a backend framework and in Django, and In Django development, frontend becomes basic html and css, though I was expecting something fancier (something like react components)

Never used a frontend framework in project or work. So how does backend stuff work in a frontend framework project?

Any answers would be helpful 🙏🏻