It is a memory which can’t be overwritten, it can be read only.
It is a non-volatile.
It uses for permanent storage.
It keeps your data save when it is turned off.
RAM is faster than Rom memories.
There are different types of ROM memory:- ROM – Read Only Memory PROM – Programmable Read Only Memory EPROM – Erasable Programmable Read Only Memory EEPROM – Electrically Erasable Read Only Memory