A software program stored in a ROM that cannot be changed easily is known as
A software program stored in a ROM that cannot be changed easily is known as firmware.
Data stored in ROM can only be modified slowly, with difficulty, or not at all, so it is mainly used to store firmware or application software in plug-in cartridges.
ROM is very small in memory size. These memory is non-volatile, in the sense, the program stored in ROM don't get erased with power shut down. ROM is used to store permanent programs, which are very essential your hardware to perform correctly.
Firmwareis a computer program that is "embedded" in a hardware device and is an essential part of the hardware. It is sometimes called embedded software. Firmware is a software program permanently etched into a hardware device such as a keyboards, hard drive, BIOS, or video cards. It is programmed to give permanent instructions to communicate with other devices and perform functions like basic input/output tasks.