Second Life is an online 3-D streaming virtual world where you can do just about anything. Unlike games you may have heard of such as World of Warcraft, Second Life is open-ended and has no objective or game.
You can use the world to hold meetings with friends and colleagues in a compelling way to communicate, prototype, share content, screen films or show pictures, create and store objects, brainstorm -- and save money on travel.
Why would you need a Second Life if you already have a first life and don't want to be one of those people who "have no lives"? Well, some people use Second Life to "have a life" if they don't have one, and others use it to enhance their lives with creative potential.
Did you know that there are hundreds of universities in Second Life? Classes in architecture, digital arts, literature, and science? Numerous non-profits holding strategizing conferences and fund-raising. Companies doing training and prototypes for business.