What critical components are included in the system unit?

The system unit is the core component of a computer that houses the essential hardware required for processing data and running applications. The critical components included in the system unit are the CPU (Central Processing Unit), which acts as the brain of the computer, performing calculations and processing instructions. Memory, specifically RAM (Random Access Memory), is crucial for temporarily storing data that is actively being used or processed, allowing for quick access and improved performance.

The motherboard is the main circuit board that connects and allows communication between all hardware components, including the CPU, memory, and other peripherals. Lastly, the hard drive is where data is permanently stored, including the operating system, applications, and files.

These components are integral to the functioning of the computer; without them, the system would not be able to operate effectively. Other options list external peripherals or network devices, which, while important to the overall computer experience, are not housed within the system unit itself.