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Alphabet Keys: Alphabet keys include letters of the alphabets
generally laid out in the same pattern as that of the typewriter. They
comprise the alphabets Aa - Zz.
Numeric Keys: Numeric Keys are handy for entering numbers
quickly. The keys are grouped together in a block like a conventional
calculator, which is named Numeric Keypad. It comprises the

numbers, 0 - 9.

Mouse

The mouse is a handheld pointing device that allows you to control the actions

of the cursor. It is a funny looking object that frankly looks like a real mouse.
Originally, computers came with keyboard without mouse. But in 1988, Dong
Engelhardt invented the mouse.

Types of Mice
The Standard Mouse: The standard mouse has two buttons, namely,
left click and right click buttons and a roller ball on the underside.
Others have additional button called the Scroll Wheel for scrolling
through pages and menus. Standard Mouse is also called Mechanical

Mouse.
Optical Mouse: Optical mouse is one of the latest innovations which
operate by using an infrared sensor. You can identify an optical mouse
by the tell-tale red glow emanating from its underside.
Cordless mouse: A cordless mouse, also called a wireless mouse, is a
mouse that connects to a computer without the use of wires. Instead, the

mouse uses wireless technologies, like Bluetooth or infrared radio
waves. Usually, a USB receiver is plugged into the computer and
receives signals from the cordless mouse. Cordless mice need batteries
to work.