Second Life is a 3D virtual world launched in 2003 that is built and owned by its residents. It differs from games in that there are no set goals or rules. Over 11 million users have accounts and around 25,000-50,000 residents are online at once. Educational institutions and businesses use it for collaboration, exploration, and interaction in a virtual space. Technical requirements include a high-speed internet connection and capable computer hardware. Many virtual worlds now exist for different age groups and purposes.