what is system unit

A system unit, also known as a computer case or tower case, is the enclosure that contains most of the hardware of a personal computer. It is the outer shell of all other main internal components of the computer. The main function of the system unit is to fix all other components together and protect sensitive electronic components from external components. The components housed inside the system unit are referred to as the internal hardware, while hardware outside the case are known as external hardware. Some of the components in the system unit include the central processing unit (CPU), motherboard, random access memory (RAM), compact disk read-only memory (CD-ROM), hard disk, fan, and power supply. The CPU is the brain of the computer and is responsible for executing instructions and processing data. The motherboard is the main circuit board that connects all the components of the computer together. Understanding the basic components of the system unit is crucial in selecting the right computer for your needs or when upgrading a computer system.