Computer Hardware is a comprehensive term which refers to all the physical parts of a computer including the digital circuitry. The software installed in the computer provides instructions for the hardware to perform necessary tasks. Unlike software and data, which are readily created, modified, or deleted, the hardware of a computer is rarely changed. The interaction between the hardware and the software, or more clearly, the boundary between the computer hardware and software, is a special type of software, known as firmware. Most computer hardware is not seen by common people as it is usually comes in embedded systems in compact disc players, electrocardiograph machines, microwave ovens, automobiles, and other devices. The computer hardware familiar to normal users is the personal computers which form only a small portion of the computers out there in the market.

Generally a personal computer consists of a chassis or a case in desktop and comprises of the following parts. Motherboard – Motherboard or system board comes with slots for expansion cards and holding parts including: Central Processing Unit (CPU) – one of the main parts of a computer which interprets and executes instructions. Random Access Memory (RAM) – the primary storage for program execution and short data storage. Buses - Also known as data bus or computer bus, a bus is a subsystem which helps to transfer data or power between computer components in a computer or between computers.