The video game industry develops, markets, and sells interactive video games and employs thousands worldwide. It encompasses many job disciplines. Computer games are played by interacting with a computer interface using a mouse, joystick, or keyboard in response to on-screen graphics, generating visual feedback. The US video game industry took in $9.5 billion in 2007, $11.7 billion in 2008, and $25.1 billion in 2010, and the UK industry employs 7,000 people and is Europe's largest market.