A joystick is an older style of gaming interface device, used as a controller in video games. It features a base, and a long 'stick', or rod, protruding prominently from the base. With one hand one grasps the stick of the rod and move it in a particular direction to make movements in the game. There is usually a button or several buttons (to activate the game's features such as 'fire' or 'jump') on the base or on the tip of the stick to press with your other fingers or thumb.
Keyboard and Mouse is common for PC games. The modern gaming console such as PS3 or XBOX uses a handheld controller pad that is different. The Nintendo Wii has brought in motion sensors to expand the game controller's application even further.