Computer parts and accessories are physical components, which can be mechanical, magnetic, electronic or electrical. These components can generally accept and store computer data, execute the operations on a computer in a proper sequence and produce control outputs. The computer parts and accessories are capable of performing many logical functions like interpretation of data, communication, computation etc.

Computer Accessories include devices that are used for enhancing and facilitating the working of a computer. These accessories may be used for a variety of purposes like; for cleaning the different parts of the computer, to keep the computer and other accessories safely, to accommodate the sound requirements of the systems, for video conferencing and capturing images around your home and office and to install any of the additional features in a computer like audio, video or gaming. Some of the examples of these computer accessories are cleaning products, computer furniture, computer speakers, web cameras, computer add-on cards, laptop accessories, keyboard accessories, computer enclosure, monitor accessories and mouse accessories.

In simple terminology computer input devices can be explained as those hardware devices, which assist the users in entering data and programs into a computer. The different types of computer input devices can be broadly classified into two types: Devices that are manually operated by the user like keyboard, mouse, joysticks, graphic tablets, game paddles, game controllers etc. Devices like sensors, transducers and scanners that transform external signals into data.

Computer Output Devices Computer Output devices are devices that receive and display information on the computer in an understandable form. These devices receive electrical pulses and then record the data passively and finally display it on the computer. The major brands manufacturing these devices are Compaq, Dell, IBM, Sony, Panasonic, Cannon, HP, Samsung and Xerox. The important features, which people take into consideration while buying these devices are screen size, monitor resolution, monitor dot pitch, adjustment options (especially to prevent problems like back pain, neck pain etc) and monitor connectivity if they are buying a monitor and the quality of print, usage, technology and design (laser or inkjet) etc for a printer. The various types of computer output devices are:

Computer Systems Computer systems can be defined as a combination of hardware equipment and software programs working together to process meaningful data. The different types of computer systems can be differentiated on the basis of technology and usage. On the basis of technology they are classified as mainframe computers, computer servers and single board computers. On the basis of usage they are personal computers, industrial computers, portable computers and desktop computers. The major brands dealing in manufacturing various types of computer systems are Dell, Compaq, Apple, IBM and Sony.

CPU Parts ,The CPU (Central Processing Unit) is a very important part of a computer, which helps in the execution of a program and thus is also called the brain of a computer. It is an internal part of the computer and can be seen after removing the CPU heat sink and CPU fan. Different parts of CPU include motherboard, PCB, PCB accessories and processor. The motherboard provides the logical and electrical connections, which helps the other components of the computer to communicate with each other. While buying CPU one must take into consideration configurations of motherboard, chip set, hard disk, RAM and their brand.