Why do we need a bootloader in an embedded device?

Why do we need a bootloader in an embedded device?

linux embedded arm bootloader

linux

Bootloader in C won't compile

c linux gcc assembly bootloader

linux

How does the bootloader pick up the command after a "restarting system with command"?

android linux linux-kernel bootloader u-boot

linux

How do I run linux on an ARM Cortex M3 board?

linux arm bootloader cortex-m3

linux

My bootloader can't be compiled with gcc 4.6 and 4.7 ... only 4.5

linux gcc bootloader

linux

uEnv.txt vs boot.scr

linux bootloader u-boot

linux