A gaming keypad is a small, auxiliary keyboard designed only for gaming. It has a limited number of the original keys from a standard keyboard, and they are arranged in a more ergonomic fashion to facilitate quick and efficient gaming key presses. The commonly used keys for gaming on a computer are the 'W', 'A', 'S', 'D', and the keys close and adjacent to these keys. These keys and style of using a keyboard is referred to as WASD. A gaming keypad will not only optimize the WASD layout, but will often contain extra functionality, such as volume control, the Esc. key, the F1–F12 keys and lighting color options. Overview The two primary, and most commonly used, devices for players to use when gaming on a computer are the mouse and the keyboard. While both are integral in the interaction of the game, their evolutionary track has not been equal. The mouse, over the years, has had better adaptation and incorporation into gaming than the keyboard has. This could easily be attributed to the fact that the mouse is a much more simplified device. The mouse has had many advances to make it a much more adapted device for gaming. It has been upgraded from a rolling ball to an optical sensor, and the optical sensor has been upgraded to a laser. The results of these progressions have allowed players increased sensitivity and accuracy while in a game environment. The mouse has also been equipped with increasingly more buttons. Starting with two buttons, the mouse can now be found with up to seventeen buttons. Buttons have also become programmable, such that the player can perform a greater variety of actions with their mouse. The keyboard has not seen as much advancement in terms of making it a formidable gaming device. The keyboard is mostly viewed as simply a conglomeration of over a hundred keys that are placed and configured for typing efficiently, not for navigating a character through a virtual world. There have been some modifications made to keyboards to entice a gamer, such as adding macro buttons on the perimeter of the keyboard, or having keys that glow in the dark. Still today the shape and layout of a keyboard remains the same, optimised for word processing but not gaming. Recently, certain companies have started to introduce mini-keyboards, or sub-keyboards, that are specifically designed to maximize the gaming experience.