Second Life (SL) is a virtual world developed by Linden Lab launched on June 23, 2003, and is accessible on the Internet. A free client program called the Viewer enables its users, called Residents, to interact with each other through avatars. Residents can explore, meet other residents, socialize, participate in individual and group activities, and create and trade virtual property and services with one another, or travel throughout the world (which residents refer to as "the grid").
Built into the software is a three-dimensional modeling tool based around simple geometric shapes (referenced as 'prims') that allows a resident to build virtual objects. This can be used in combination with the Linden Scripting Language which can be used to add functionality to objects. More complex three-dimensional sculpted prims (colloquially known as "sculpties"), textures for clothing or other objects, and animations and gestures can be created using external software. SL's Terms of Service provide that users retain copyright for any content they create, and the server and client provide simple digital rights management functions.