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A pointer represents a small symbol on the screen. It usually appears on the screen in Graphical User Interface (GUI) environment.

A pointing device is an input device. It is used to control the movement of the pointer or cursor on the screen. It can also be used for:

Sending command signals to the computer.
Selecting items on the screen.
Selecting commands from commands menu.
Drawing graphs etc.

Names of Some Pointing Devices
The names of some most important devices are as follows:
Mouse
Trackball
Pointing Stick
Joystick
Touch pad
Touch screen
Light pen
Digitizing/Graphic tablet