Alphanumeric Keyboard

A very common, general purpose, input device that allows text (abc…), numbers (123…) and symbols (%$@...) to be entered into a computer.

A keyboard is simply a set of buttons. Each button has a symbol assigned.
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Numeric Keypad

A small keyboard that only has numbers.

Used to enter numeric data into computers such as those in ATMs.

Most computer keyboards have a numeric keypad on the right side, and most mobile phones (there are also computers) have a one for entering phone numbers, etc.
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This is a device with a numeric keypad used to enter a person’s Personal Identity Number (PIN) e.g. when paying with a credit card.

PIN pads are also found on electronic door locks – you enter a PIN to unlock the door.
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