Short for Read-Only Memory, ROM is a storage medium that is used with computers and other electronic devices. As the name indicates, data stored in ROM may only be read; it is either modified with extreme difficulty or not at all. ROM is mostly used for firmware updates. A simple example of ROM is the cartridge used with video game consoles; which allows one system to run multiple games. Another example of ROM is EEPROM, which is a programmable ROM used for the computer BIOS, as shown in the picture.


Note: Unlike Random Access Memory (RAM), ROM is non-volatile which means it keeps its contents regardless of whether or not it has power.

Related pages

Also see: EPROM, Memory terms, PROM