ROM - GCSE Computer Science Definition

ROM stands for Read-Only Memory, which is a type of computer memory that is used to store important instructions that the computer needs to start up and work properly. Unlike RAM (Random Access Memory), which loses its data when the computer is turned off, ROM keeps its information even when the computer is powered down. This is because ROM is non-volatile memory, meaning it doesn't need power to keep its data safe. ROM usually contains the BIOS (Basic Input/Output System), which helps start the computer and checks that all parts are working correctly. The ROM also contains the bootstrap, which is used to pass control from the BIOS to the operating system. In essence, ROM is like a book that can be read but not changed easily, and it's essential for the basic functioning of a computer.