boot loader is the first software program that runs when a computer starts. It is responsible for loading and transferring control to the operating system kernel software. The kernel, in turn, initializes the rest of the operating system
GRUB (GRand Unified Bootloader), which is installed by default, is a very powerful boot loader. GRUB can load a variety of free operating systems, as well as proprietary operating systems with chain-loading (the mechanism for loading unsupported operating systems, such as DOS or Windows, by loading another boot loader).
You may install the boot loader in one of two places:
The Master boot record (MBR)--- This is the recommended place to install a boot loader, unless the MBR already starts anther operating system loader, such as system commander. the MBR is a special area on your hard drive that is automatically laded by your computer's BIOS, and is the earliest point at which the boot loader can take control of the boot process. if you install it in the MBR, when your machine boot GRUB present a boot prompt. you can then boot Red Hat Enterprise Linux or any other operating system that you have configured boot loader to boot.
The first sector of your boot partition: nt This is recommended if you are already using another boot loader on your syatem. In case your other boot loader takes control first you can then configure that boot loader to start GRUB, which will boot Red Hat Enterprise Linux.
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