BIOS

Driver

Program used by devices to tell the CPU how to run them.

Read-only memory chip (ROM)

Motherboard stores the BIOS in a special type of memory.

Unified Extensoble Firmware Interface (UEFI)

UEFI performs the same function of starting your computer as a traditional BIOS.
It's more compatible with newer hardwares.

Power On Self Test(POST)

BIOS runs it when you boot up your computer.
It figures out what hardwares are on the computer.

CMOS chip

Stores basic data about booting your computer like the date, time and how you wanted to start up.