1.1 Cloud Computing services: It is a framework and primarily consists of three services (Figure 1.1): 1) Infrastructure as a service (IaaS) 2) Software as a service (SaaS) 3) Platform as a service (PaaS) 1) Software as a service: It means granting the license of software application to the customers. In most cases licenses are provided on demand. 2) Infrastructure as a service: It implies a technique for providing all from operating systems to servers and storage is via IP based and it is a part of on demand service and no need for the client to purchase software or servers but the client can obtain the resources in an on demand service. 3) Platform as a service: Out of three, PaaS is considered as complex. PaaS is bit similar to SaaS. The