Gaikai is a technology that lets gamers play the latest state-of-the-art video games instantly on any web browser or internet-connected device - including mobile, tablets, and televisions. No game to download or install - just click and play instantly.
Have you ever wanted to play games without a CD, or even without downloading anything? Now you can! It's called "Gaikai"(pronounced "guy-kai"), a Japanese word that loosely translates to "open ocean". You don't need to register or to download anything to use this new technology, either!
The thing is that you chose a game that you want to play, and they load it from their servers. You need a fast internet connection
to run games without lag. There are a lot of games available on "Gaikai" from Crysis 2, Battlefield 3 to Assassins creed, even to games such as The Sims and many more. Check it out here