Cloud computing is a new form Internet based computing that provides shared computer processing resources and data to computers and other devices on demand. With the database as service, all the data of employees can be stored in the cloud database. Cloud computing offers a new way of services and has become a popular service provider.Storing user data at cloud data centre reduces storage burden of user devices and makes the data convenient for use. Cloud computing is the delivery of computing services—servers, storage, databases, networking, software, analytics and more—over the Internet. Most cloud computing services fall into three broad categories: infrastructure as a service (IaaS), platform as a service (PaaS) and software as a service (Saas). These are sometimes called the cloud computing stack, because they build on top of one another. Knowing what they are and how they are different makes it easier to accomplish your business goals. Cloud computing, often referred to as simply “the cloud,” is the delivery of on-demand computing resources—everything from applications to data centers—over the internet on a pay-for-use basis. Cloud-based applications—or software as a service—run on distant computers “in the cloud” that are owned and operated by others and that connect to users’ computers via the internet and, usually, a web browser. Platform as a service provides a cloudbased environment with everything required to support the complete lifecycle of building and delivering web-based (cloud) applications—without the cost and complexity of buying and managing the underlying hardware, software, provisioning, and hosting.