This may seem like an unbelievably stupid question but could someone please explain to be the difference between the master boot record (MBR) and the grub/lilo bootloaders. Its something thats been confusing me. Is the MBR the windows equivilent of grub or lilo? Or is it a location where grub and lilo are placed and run from when the pc boots.

Do all pc's have an MBR or just ones with a windows OS?

Thanks,
Ironic