What type of computer memory is non-volatile, retaining data even without power?

• A. Random Access Memory (RAM)
• B. Cache Memory
• C. Read-Only Memory (ROM)
• D. Virtual Memory

Answer: (C)

The type of computer memory that is non-volatile and retains data even without power is Read-Only Memory (ROM). ROM is a crucial component in computers as it stores firmware, which is essential software that helps the computer boot up and perform initial hardware checks when powered on. This type of memory is programmed during the manufacturing process and cannot be easily modified or written to by the user, hence it retains its data consistently, regardless of whether the system is on or off.

In contrast, Random Access Memory (RAM) is volatile memory, meaning it loses all stored information when the power is turned off. Cache Memory is also volatile and serves as a high-speed storage layer that temporarily holds frequently accessed data to speed up operations. Virtual Memory is not a physical type of memory; instead, it is a memory management capability that uses a portion of the hard drive as an extension of RAM and is therefore also dependent on the power being on. Understanding these distinctions highlights the unique role that ROM plays in maintaining critical data independently of power status.