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ROM does.

It's a type of non-volatile memory burned on a chip and usually soldered on the motherboard that the CPU fetches instructions from.

Usually the engineers will map addressable memory on to the CPU's address space, one being BIOS instructions, and the CPU will take those instructions.

As it loads a bootloader from another non-volatile storage device, like Windows on the first sector of a hard disk drive, BIOS the ROM memory willtransfer the first instructionto the processor's Instruction Pointer, and the Windows bootloader will keep issuing instruction, ultimately and effectively (most of the time) loading your operating system, device drivers, controlling the computer's memory, etc.

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