Now, a bootloader is a piece of software, a very basic one, that loads the Operaing System the user requests. Windows has its own, Mac has its own. And most of the Linux Distros ship with this bootloader called as the GRUB.
Ever wanted a fancy cool Hacker like interface for your Linux distro? I did. And now I have it installed and all configured. As I may have mentioned before, I am a Linux fanatic. Right now I have Arch Linux and Ubuntu installed along side Windows.