ROM (Read Only Memory)
RAM (Random Access Memory)
An acronym for Read Only Memory, ROM is computer memory on which data has been pre-recorded. The programming code and/or data on a ROM chip is written to the chip at the factory. It can be read, but it cannot be erased or removed. It's permanent. ROM retains its data or content even when the computer is turned off, unlike a computer's main memory (RAM), which needs a constant charge of electricity to keep its information. For this reason, ROM is considered to be 'non-volatile' and RAM is 'volatile'.
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