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RAM is volatile - meaning that whenever power is taken away from it it is wiped.

ROM is non volatile - meaning that the data is always kept there whether there is power is there or not.

BOOT files which is basic machine code and is needed to boot up the computer to give the first BIOS (basic input output system) is kept on ROM because it is always kept there. If it was kept on RAM then it would be wiped everytime you turn the power off which would mean it would work.

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