ROM (Read Only Memory) is typically used to write permanent data
or instructions to a system for use even after the computer is
turned off.
Examples of ROM are your BIOS and Firmware
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Read Only Memory(ROM) Basic Input Output System(BIOS) or
firmware chips are "Electrically Erasable and Programmable Read
Only Memory(EEPROM)" chips, these kind of chips can be upgraded by
flashing.