Summary
Boot loaders are what make multi-OS configurations convenient, or even possible. Without multi-OS boot loaders, we would have to use FDISK to change the bootable partition and then reboot. The design of the PC boot process provides several possible locations for "hooks" into the process, where a boot loader can take over and redirect the boot process to suit your desires.
The decision of what hook location is used is important, but it is not the only important factor in determining how a boot loader operates. Most boot loaders are quite limited in one respect or another, so it's important that you understand the features available in your chosen boot loader—or know what features you want, so that you can select an appropriate one for ...
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