Final answer:
Loading the operating system into a personal computer is known as booting. This process begins when the BIOS or UEFI initializes the hardware and then loads the OS from the hard drive into the RAM.
Step-by-step explanation:
The process of loading the operating system into a personal computer is called booting. When you turn on your computer, the Basic Input/Output System (BIOS) or Unified Extensible Firmware Interface (UEFI) initializes the hardware components and starts the process of loading the operating system (OS) from the hard drive into the computer's RAM. This is typically referred to as the boot process, and once it is complete, the operating system takes over, enabling you to interact with your computer.