What type of memory typically contains data that can only be read, not written to?

The choice of Read-Only Memory (ROM) as the correct answer is appropriate because ROM is specifically designed to store data that should not be altered or written to under normal circumstances. This type of memory is typically used to hold firmware or software that is essential for hardware functionality, such as the BIOS in a computer, which initializes hardware during the boot process.

In contrast, Random Access Memory (RAM) is designed for temporary data storage that can be both read from and written to, allowing for dynamic data manipulation and execution of programs. Similarly, cache memory, although fast and situated close to the CPU, also allows for read and write operations to expedite access to frequently used data.

Flash memory, while it has characteristics closer to ROM in that it can retain data without power, is classified as writable memory that can also be erased and rewritten, thus enabling data updates and modifications. Therefore, for memory that specifically emphasizes read capabilities without the ability to write, ROM stands out as the correct choice.