What role does ROM play in a computer system and how does it contribute to its overall functionality?

Read-only memory (ROM) in a computer system stores essential instructions and data that are permanently programmed during manufacturing. It plays a crucial role in booting up the system and providing basic functions, such as firmware updates and system diagnostics. ROM contributes to the overall functionality of a computer by ensuring that key processes are carried out smoothly and reliably, even when the system is powered off.