Question: What characteristic of read-only memory (ROM) makes it useful?

Answer:

The characteristic of read-only memory (ROM) that makes it useful is its non-volatile nature. ROM retains its data even when the power supply is turned off or interrupted. This means that the information stored in ROM is permanent and cannot be easily modified or erased, providing a reliable and secure storage solution for essential firmware, instructions, and data that need to be preserved in electronic devices.