What is ROM?

ROM stands for Read Only Memory. It is one of the computer’s main memory devices. It contains vital operational programs. It is permanent in nature and is also called non-volatile memory. If the contents of the ROM is lost (using some special technique), the computer cannot work.
There are various kinds of ROM. PROM, EPROM, EEPROM are some types of ROM.

PROM – It is a programmable memory and is programmed by a machine called PROM burner where the programming is done only once. After it, the contents cannot be erased.
EPROM – It is erasable by exposing it to a high intensity ultraviolet light. Once programmed, all the contents are to be erased if it is to be reprogrammed.
EEPROM – It is electrically erasable. Specific contents can be erased by special technique.

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