Read-only memory (ROM) plugged onto a microcomputer’s motherboard.
ROM can only be read from and it cannot be written to. Its contents are stored during manufacturing. It is nonvolatile meaning that its contents are not erased (lost) when the computer is shut down or when power goes off. It mostly contains programs that are always needed for computer operation. An example is the power-on self-test (POST). The POST runs when you turn on your desktop computer. It beeps and then checks the proper functioning of different computer components.
