Rom is a type of computer memory that is non-volatile, meaning it retains its data even when the power is turned off. It stands for "Read-Only Memory," and is primarily used to store firmware, which is the software that is closely tied to specific hardware. This allows devices like computers, game consoles, and smartphones to boot up and perform basic functions. Unlike RAM (Random Access Memory), which is temporary and loses its data when powered down, Rom is designed to be read but not easily modified. This makes it ideal for storing essential instructions that a device needs to start up and operate correctly, ensuring stability and reliability in various electronic systems.