Memory whose contents can be accessed and read but cannot be changed. ROM is inherently non-volatile storage-it retains its contents even when the power is switched off, in contrast to RAM. Normally PC's basic input/output system is stored permanently in a set of ROM chips.

【电脑】唯读记忆体。记忆体的内容可以被读取，但是不能被改变。例如：一般CD-ROM 即是。ROM 是非挥发性的记忆体，电源切掉后，其内容还可继续保留住，与 RAM 相反。通常个人电脑的 BIOS 都永久地存在 ROM 中。