The document defines and describes the major hardware and software components that make up a computer system. It explains that hardware refers to the physical parts like the processor, memory, input/output devices, and storage media. It then proceeds to define key hardware components including the CPU, computer case, monitor, video card, keyboard, mouse, drives, ports, and networking equipment. It concludes by explaining that software, like operating systems and programs, provides instructions to the CPU to allow the computer to function and users to interact with it.