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 below.


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