Second Life (abbreviated to SL) is an Internet-based virtual world which came to international attention

Link to web site:
www.secondlife.com
a downloadable client program enables its users, called “Residents”, to interact with each other through motional avatars, providing an advanced level of a social network service combined with general aspects of a metaverse. Residents can explore, meet other Residents, socialize, participate in individual and group activities, create and trade items (virtual property) and services from one another.
Second Life is a 3-D virtual world entirely built and owned by its residents. Since opening to the public in 2003, it has grown explosively and today is inhabited by a total of 5,179,495 people from around the globe.
* From the moment you enter the World you’ll discover a vast digital continent, teeming with people, entertainment, experiences and opportunity. Once you’ve explored a bit, perhaps you’ll find a perfect parcel of land to build your house or business.
* You’ll also be surrounded by the Creations of your fellow residents. Because residents retain the rights to their digital creations, they can buy, sell and trade with other residents.
* The Marketplace currently supports millions of US dollars in monthly transactions. This commerce is handled with the in-world unit-of-trade, the Linden dollar, which can be converted to US dollars at several thriving online Linden Dollar exchanges.