Basically, modern distros are forks of older distros. So, Ubuntu is a fork of Debian, and Fedora is a fork of Red Hat. Both are Linux, but the "extras" are completely different. Debian uses apt to install applications; Red Hat uses yum. I personally prefer apt, but it doesn't really matter in the long run.
Linux Mint is a fork of Ubuntu, so the advantage is you get a nice pretty interface, but you can use Ubuntu's repositories for installing things.
Linux Mint is a fork of Ubuntu, so the advantage is you get a nice pretty interface, but you can use Ubuntu's repositories for installing things.