Computer Organization- Block Diagram of Computer

1. Input Device : Usually a keyboard and mouse, the input device is the conduit through which data and instructions enter a computer
2. Memory : Enables a computer to store, at least temporarily, data and programs.
3. Mass Storage Device: Allows a computer to permanently retain large amounts of data. Common mass storage devices include disk drives and tape drives.
4. Output Device : A display screen, printer, or other device that lets you see what the computer has accomplished.
5. Central processing unit (CPU): The heart of the computer, this is the component that actually executes instructions. The ALU and the CU of a computer system are jointly known as the central processing unit (CPU).

• Control Unit (CU): The process of input, output, processing and storage is performed under the supervision of a unit called 'Control Unit'. It decides when to start receiving data, when to stop it, where to store data, etc. It takes care of step-by-step processing of all operations inside the computer.
• Arithmetic Logic Unit (ALU): The major operations performed by the ALU are addition, subtraction, multiplication, division, logic and comparison.