Example: "Cell phones often contain programs stored in a PROM chip."

PROM stands for "Programmable Read-Only Memory" and is pronounced "P-ROM." It is a type of ROM used in small electronic devices, such as a mobile phones and RFID tags. PROM is programmed by burning fuses within the memory, meaning it can only be programmed once. Therefore, whatever is initially programmed into PROM will be stored permanently in the memory.

Two other types of PROM can be erased and reprogrammed, including EPROM (Erasable Programmable Read-Only Memory) and EEPROM (Electrically Erasable Programmable Read-Only Memory). EPROM can be erased using strong ultraviolet light, while EEPROM can be erased using an electrical charge.

Updated: September 7, 2009