A gaming keyboard is specially designed for gaming purpose and it has lots of additional features as compared to ordinary keyboard. Some of the key differences between the two are :
LCD Screen : LCD is a very important part of a gaming keyboard. This feature lets you (gamer) display in-game statistics or monitor system performance on the keyboard.
Programmable Keys : This lets you re-program some or all of the keys to your desired action so that they can be activated in-game actions and trigger sequences of moves using macros with single button press.
Game Mode : This mode simply locks the Windows key so that you cannot press it while playing a game and return to desktop.
Backlighting : Mostly, intense gaming take place in a rather dark ambient and that is where backlight let you see your keys even if its very dark. And these lights looks very beautiful as well.
Multimedia Control Keys : Simply, let you change volume levels and provide mp3 control during a game without having to switch back to desktop.
Anti-Ghosting : Ghosting is a state of keyboard when it does not respond to multiple keystrokes at all or there is a delay. Anti-Ghosting feature handles this problem by letting the gamer press a set or all of the keys simultaneous without any delay of response. This is crucial feature for any gamer because many a times you have to use different keys at the same time to execute a certain move.
At last, I recommend you to buy a gaming keyboard instead of an ordinary one. Moreover you can use it in your normal tasks as well.