Abstract: Traditional business applications have always been very complicated and expensive. The amount and variety of hardware and software required to run them are daunting. You need a whole team of experts to install, configure, test, run, secure, and update them. When you multiply this effort across dozens or hundreds of apps, its easy to see why the biggest companies with the best IT departments arent getting the apps they need. With cloud computing, you eliminate those headaches because you’re not managing hardware and software-thats the responsibility of an experienced vendor like salesforce.com. In this paper we define a various platform of cloud computing and define the comparison between various infrastructure as a service platform and platform as a service platform.