Mouse

A small input device with one or more buttons used as for pointing or drawing.As you move the mouse in any direction, an on-screen mouse cursor follows the mouse movements; all movements are relative. Once the mouse pointer is in the correct position on the screen, You can press one of the mouse button's to initiate an action or operation. Different user interfaces and file programs interpret mouse clicks in different ways. A mouse has been standard equipment on the Macintosh Family of computers for a long time, and with the rising popularity of graphical user interfaces such as Microsoft Windows on DOS computers, the use of a mouse is growing there, too.

Software

Software is an interface between the computer and the user. It is a group of programs that tell the computer what to do and how to do. Hardware cannot be used without software. A CD player becomes useless without CD's and a computer without software. Software is stored in a hard disks and magnetic tapes.
  There are thousands of software written for computers which are used for different applications. This can be divided into three major groups, which are as follows:
   1.Application software
   2.Utility software
   3.System Software

BIOS

It stands for Basic Input / Output System and it defines the RAM address parameters and provides standard and fundamental routines that controls the keyboard, video display, disk drives and other peripherals.

power supply

This part is also called by the name of SMPS (Switch Mode Power Supply) and is fitted inside the central Processing Unit cabinet. It converts the high voltage current into a low voltage like 5 volt or 12 volt. if the components are directly connected to a normal city line, they will blow up.

Sound Card

Presently the sound card is being used in the Multimedia Personal Computer. By the sound card, we can record the sound into the computer that is to say we can input the data in the form of sound. in addition to this, if our computer has a sound card then we can also play the audio CD, mp3 and we can do the editing of the wave files present in the computer.

Processor

Processor in the computer functions in the same way as the heart in the human body. All the operations relating to the processing in the CPU are associated with this processor only. If the Processor develops any fault, the computer us not in order, our computer shall function at a very slow speed.

monitor

Monitor is also called as Display.It is a devices which shows virtual on the screen as data and instructions given to the computer through any input device like keyboard or mouse.in earlier period crt monitor is used which are of different types, models and sizes. It consumes alot of electricity.such monitor only display the two colors:black & White. After that colour monitor are available in the market that can display more than 256 different colours.till now alots of tecnological change brings the LCD monitor. sony, samsung,acer, tossiba etc are the name of the leading companies which produces the lcd monitors.

cdrom

cd-rom is the most safe storage devices.in market we can have it as CD or DVD-ROM. it is only readable that means once on CD data are written, it cannot be erease so for long term storage it can best  to used it.it has alot of advantages as it cannot be erase the data easily once it is filled. So in market we can haveCD of 700MB and DVD-ROM from4.7GB to 16GB.

pendrive

pendrive is the most simplest divice that can be used as data store.it is easy to used.it can be use as portable devices. As costomers demand we can find different models of it . the most used in the market is 2gb,4gb and 8gb pendrive.different companies produces new and fastest devices that can be easily carried out ay anywhere. it is erasible so most people preffer this devices.

computer

computer is an electronic media that perform the most manupulating works of the human. likewise it performs the day to day activities of the human does. it is used as machinery purpose in big industries,factories, mines etc.for the easyness of we human computer plays the important role.people are using it as the friends of life.