Composite Devices

A device is said to be a composite device when it treats each of its component as its child device. 

Game Controller

Fig 1.1 Game Controller

A controller, in a computing context, is a hardware device or a software program that manages or directs the flow of data between two entities. In computing, controllers may be cards, microchips or separate hardware devices for the control of a peripheral device.
Game Controller is the input device used to control a video game. Controllers have evolved from a single joystick with one button to devices with joy sticks, pedals and dozens of buttons.

Fig 1.2 Joystick

Sources

• “Encyclopedia.” Video Game Controller Definition from PC Magazine Encyclopedia, www.pcmag.com/encyclopedia/term/53849/video-game-controller.
• “What Is Controller? - Definition from WhatIs.com.” WhatIs.com, whatis.techtarget.com/definition/controller.