Both of them serve for somewhat similar purpose ie storing Although in a different way. ROM /BIOS (BASIC INPUT OUTPUT SYSTEM ) Both of them have flat shape . RAM (Random Access Memory) can be modified. ROM ( Read only memory) is just that, Read only. Both are "chip" based memory, but only RAM can me modified.
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Actually By Default this is present in BIOS(ROM) and at the boot time Operating System loads it to the RAM.
If it resided in RAM, it would get lost when you power off the system.
primary memory is built in memory on a computer it is the main type of memory.... eg RAM ROM and HDD
cache
all rom is static