ROM or in its longest form read-only memory, is computer memory used in computers and other electronic devices.
As the name suggests, the data stored in the read-only memory storage medium is intended to be only red. This type of memory is used specially for firmware updates and application software in plug-in cartridges.
Modifications to data in the ROM are hard to do and usually they are not done at all.
There are different types of read-only memory storage medium solutions. These are divided into some main categories, including semiconductor- based and optical storage, such as a CD-ROM.
In the semiconductor space, there is the programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), and the electrically erasable programmable read-only memory (EEPROM).
Within EEPRON there are further types, including electrically alterable read-only memory (EAROM) and flash memory.
Historical ROM technologies include diode matrix ROM, resistors, core rope, and dimond ring stores.