The ROM full form in computer is Read Only Memory. It is a non-volatile memory that permanently stores instructions for your computer. Data stored is not erased when a computer restarts or shut down. It stores information that is necessary to run the computer/laptop.
ROM allows only read operation. It does not allow write operation. ROM is cheaper than RAM. As said earlier, ROM is a non-volatile memory i.e. the data stored can not be erased when a computer shut down or restarts or even power failure. Hence it is used as permanent storage. It can’t be accidentally changed. It is easy to test.
ROM is not used for buffering purpose. It has less memory space as compared to the RAM. The very first operation in the computer/laptop is performed in ROM (during the booting process). It generally stores programs that are required for the operation of a computer. ROM are generally more reliable than RAMs.
Types of ROM
There are four types of ROM i.e. MROM, PROM, EPROM, and EEPROM.
MROM stands for Masked ROM, PROM stands for Programmable Read Only Memory, EPROM stands for Erasable and Programmable Read Only Memory and EEPROM stands for Electrically Erasable and Programmable Read Only Memory.