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Bootloader is a piece of code that runs before any operating system is running.
Bootloader are used to boot other operating systems, usually each operating system has a set of bootloaders specific for it.
Bootloaders usually contain several ways to boot the OS kernel and also contain commands for debugging and/or modifying the kernel environment.
Bootloader is the part of the Operating System itself.
Operating system is a system software that interacts with the software running could be MS Word, or excel and the hardware of the computer.
The speed of the computer may not always depend on how powerful the OS is. It could depend upon virtual memory, cache , ram and other hardware configurations. One can regularly run the defragmenter and do a %temp% for optimum performance.
Also the windows OS,( xp, win7, win8 or8.1 is the system software ) is different from Microsoft office software like word, excel. In most cases the OS comes free with the computer but you may have to pay for the application soft wares. Also be aware of the demo version soft wares loaded as they would last for a limited period after which you would be prompted to purchase the software.
operating system a container of a lot of programs that cant be counted , the strongest thing at any operating system is the kernel
I agree with the answer added by Subhranshu Ganguly