Computer hardware includes the physical parts of a computer, such as a case, central processing unit (CPU), monitor, mouse, keyboard, computer data storage, graphics card, sound card, speakers, and motherboard. CPU is regarded as the computer's brain. The CPU is responsible for all data processing operations. It saves information such as data, intermediate results, and instructions (program). It directs the operation of all computer components. Additional InformationDisk Drive can store operating systems, software programs, and other files using magnetic disks. Hard disk drives control the reading and writing of the hard disk that provides data storage. HDDs are used either as the primary or secondary storage device in a computer. The control unit is a component of a computer's central processing unit that directs the operation of the processor. A CU typically uses a binary decoder to convert coded instructions into timing and control signals that direct the operation of the other units. Most computer resources are managed by the CU. ?An operating system (OS) is a program that manages a computer's resources. The allocation of those resources among other programs. Typical resources include the central processing unit (CPU), computer memory, file storage, input/output (I/O) devices, and network connections. ?Therefore, the hardware unit to perform all the arithmetic and logic operations of the computer is the CPU.