A CLOUD APP is an application program that functions in the cloud, with some characteristics of a pure desktop app and some characteristics of a pure Web app . A Web app is stored entirely on a remote server and is delivered over the Internet through a browser interface. Desktop apps, cloud apps can provide fast responsiveness and can work offline. Cloud Apps are what business demands. Cloud applications for mobile do not bug you with notifications, they will simply update automatically. Many mobile cloud applications do not need access to your device’s confidential information so the issue of security is taken care of. There is no restricted storage capacity. Numerous applications in your mobile cloud can be saved. The data can be erased stored on your mobile cloud and we need to simply change our login credentials. Cloud environment provides storing and accessing data and programs over the Internet instead of your computer’s hard drive. These apps are a boon for IT value optimization. The cloud has brought promise of financial and business benefits including reduction in IT capital and operational expenditures. Cloud technology has been around for quite a while now and has become an essential part of every business. Cloud opens the doors for rapid growth and expansion of startups. Cloud apps certainly offer much better protection against theft and cyber attacks. Security is built into the cloud computing architecture from the start.