while takling about the computers we usually say about the hardware and software...
To understand about the computer let us discuss the defination of computer.

defination:-Computer is an electronic machine which has an ability to accept data,process it,make calculations on it and give the result. The computer takes input from the input devices(mouse,keyboard etc.) and it gives results from the output devices(monitor,speaker).So computers has two components called hardware and software. which work togather and provide services to its users.

Now we will discuss about the hardware and software:-

Hardware:-the components which we can touch and see.example:-keyboard,mouse,screen,cpu.

software:-the components of computer which we only see and cannot touch.example:-microsoft office,internet explorer.

Software makes the users to easily work with the hardware.

Data:-the meaningless characters like alphabets,digits etc. which genrally has no meaning.

Information:-the meaningful data which is obtained from computer is called information.

various input devices:-

1. Mouse:-Mouse is an pointing device. It has a roller on its base. When we move it on the smooth surface, the roller rolles and gives the direction in x and y co-ordinates to the computer.

Using a mouse

A mouse is used by moving it on a flat surface, it won't work if you pick it up.  Movement of the mouse controls the position of the mouse pointer on the screen. The mouse pointer can take many shapes, the most common being an arrow (). The shape of the pointer depends what you are pointing at and is an indication of the type of operation which can be carried out at that time.

Some systems, especially laptop computers, have a 'trackball' fitted instead of a mouse. These operate in the same way except that the mouse pointer is moved by rolling the ball with your finger, thumb or the palm of your hand instead of moving over a flat surface. Another type of mouse, known as a pen mouse, is used like an ordinary pen.

Holding the mouse

Cup the mouse comfortably in your right hand (for left hand use, see below) so that your index finger rests on the left mouse button and your middle finger rests on the right button. Don't grip the mouse really tightly, otherwise it will be harder to use.  In Windows the right mouse button is also useful and serves a special purpose, outlined below.

If you want to use the mouse with your left hand, you can swap the use of the mouse buttons so that the index finger of your left hand is used with the right mouse button.  If you regularly swap between different PCs, this may become annoying, it also may be annoying to others if they don't know how to change it back!  However, if using a University PC where you log in each time you use it, left-handed settings will be available to your login, but not to other users using the PC.  Despite this, many left-handers use the mouse with their right hand.

Mouse operations

Windows uses icons (small pictures) on the screen to represent computing objects that can be used or manipulated, menus (from which options can be selected that carry out particular tasks) and dialog boxes (that request further information from you). The mouse is used to select and manipulate objects, choose options from menus and respond to dialog boxes.

The different mouse operations are:

Right mouse button

In Windows clicking the right mouse button generally gives a menu of options relevant to the particular object pointed at when the right button is clicked. Such context menus can be very useful and you are recommended to get into the habit of frequently using the right mouse button when using Windows, particularly if you can't find what you want on a menu elsewhere.

Some mouse tips

• Don't be frightened of the mouse - if it is held gingerly or if the buttons are jabbed-at the mouse may move whilst clicking, with unexpected results
• If you are using a mouse with a roller ball (to check, turn the mouse upside down and see if there is a moving ball on the bottom) it is worth using a proper mouse mat as the mouse may not respond smoothly if used on a hard or slippery surface and this should keep the mouse ball cleaner
• If the mouse reaches the edge of the mat or table before reaching the end of the movement you intend, lift it and reposition it
• Double-clicking has to be two clicks in rapid succession otherwise you will get unexpected results. If after some practice you still have difficulty double-clicking it may help to reduce the double-click speed .
• If after some practice you still have difficulty pointing with accuracy it may help to reduce the mouse sensitivity.

If the mouse pointer responds erratically:

• If the mouse requires batteries, these may need changing
• If the mouse has a mouse ball, it may need cleaning.  To do this,  with the power to the computer turned off, turn the mouse upside down and release the 'trap' that holds the mouse ball (as indicated on the mouse casing). Clean the mouse ball with warm water (do not use a harsh solvent such as alcohol) and then dry it thoroughly with a clean cloth. Using a damp cotton bud carefully wipe the ball rollers inside the ball socket. Replace the mouse ball.