Keyboard

• Keyboard is the most common data entry device having more than 100 keys on it. Almost all general-purpose  computers are supplied with a keyboard.
• When you press a key, a number (code) is sent to the computer to tell it which key you have pressed. Keyboards  are often used in conjunction with a screen on which the data entered are displayed.
• The keys on a keyboard are usually arranged in the same order as those on a typewriter. This layout of keys is called QWERTY because Q-W-E-R-T-Y is the order in which the letters occur on the top row of the keyboard.
• Keyboards are widely used because they provide flexible method of data entry and can be used in most applications. However, they do have limitations like entry using keyboard is a slow form of data entry process and is prone to error.