
Read-Only Memory, ROM is a storage thing that is used with computers and other electronic devices. This type of memory chip holds information that can be read but NOT written.
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When the power is lost or turned off ROM will keep the information stored on it. ROM is mainly used in a starting up the process in a computer. (RAM is used AFTER starting up and loading the operating system) ROM is mostly used for firmware updates.
Why We Need ROM ?
Because data is fully incorporated at the ROM chip's manufacture .if a mistake is made in manufacture, a ROM chip becomes unusable. The most expensive stage of ROM manufacture, therefore, is creating the template.
Where is the ROM on a computer?
For the computer the main EEPROM and BIOS is on the computer motherboard.

ROM is non-volatile, which means it keeps its contents regardless of whether or not it has power.
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