The keyboard is the most common input device for entering
numeric and alphabetic data in to a computer system by pressing a set of keys
which are mounted on the keyboard, which is connected to computer system.
The keys on computer keyboards are often classified as
follows:
Alphanumeric Keys - letters and numbers.
Punctuation Keys - comma, period, semicolon, and so on.
Special Keys - function keys, control keys, arrow keys, Caps
Lock key, and so on.
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