1) Second Life is a 3D virtual world launched in 2003 that has over 18 million users who interact through customizable avatars. 2) Unlike most virtual worlds which are located on a single server, Second Life is distributed over a network of servers allowing for a large scale environment. 3) Within Second Life, users can socialize, collaborate on projects and create virtual objects and spaces. Many universities and companies utilize Second Life for a variety of educational and business purposes.