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Wikipedia says…

Second Life (abbreviated as SL) is an Internet-based virtual world launched on June 23, 2003, developed by Linden Research, Inc (commonly referred to as Linden Lab), which came to international attention via mainstream news media in late 2006 and early 2007. A free downloadable client program called the Second Life Viewer 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, and create and trade items (virtual property) and services with one another.