Final answer:
Firmware is the type of software that runs on 'bare metal' and doesn't require a separate operating system.
Step-by-step explanation:
The type of software that runs on 'bare metal' and doesn't require a separate operating system is Firmware. Firmware refers to the software that is embedded in a hardware device and is responsible for controlling its functionality. It is typically stored in non-volatile memory and is designed to be self-contained, eliminating the need for an additional operating system.