In today’s world, the trend of cloud computing is going through a modification from network driven process to system driven substance. Once the units that were controlled by registering and warehousing assets by inaccessible server farms, are now coming up with the data storage, data mining, applications, recreation, social interaction, process finance and data exercises by distributing computing technology. In 2011, Apple developed a system called iCloud to grasp favorable information about music, films, features and personal information. Now with the help cloud computing, services are available beforehand with the individual gadgets such as laptops, tablets, smart phones and many more which earlier restricted the employees to stay in particular workstations to complete their work. But now with the advancement of cloud computing, they can move any place and work just with the connection of internet.

Cloud service providers proficiently store petabytes of information from their clients from across the world. The recognition of the cloud service providers has been earned through their control over the servers. Thus it has seen that Amazon is the pioneer in IaaS where Google entirely focuses on the areas of SaaS and PaaS models. For private cloud Eucalptus [269], Open Nebula, Nimbus and OpenStack are some of the world known distributors.

SaaS has been provided with a wide array of cloud service providers where the users have the direct access to those services in the unaffected manner. The common diagram figures out the services of Google with Gmail, Google Calender, Google Docs, Google teams and Microsoft and Picasa. In case of IaaS the service providers stresses on infrastructure and services in order to avoid any kind of server failure or other technical problems. Amazon is the world known provider of IaaS.

On the other hand Paas provides the platform with the simple infrastructure and database where the service providers have to take the entire responsibility for the server maintenance and infrastructure up gradation. In PaaS, the users are not allowed to customize the programs. Earlier Google App Engine, Force.com and Microsoft Azure emphasized on the traditional data storage management design by Salesforce.com. PaaS helps in the development, deployment and testing of application instantly and of course in the cost effective manner. With the help of this technology the enterprise operators or the third party providers are able to manage OSes, servers, networking storage and the PaaS software itself.

The cloud customers and the cloud service providers are highly benefited with these 3 types of cloud service platforms. While in SaaS the customers has to depend on the interface of the cloud model, the IaaS users are responsible in managing application, data, middleware, runtime and OSes. Still cloud service providers manage servers, virtualization, storage, hard drives and networking. The main advantage of IaaS is that here the users can access in the infrastructure from where they can install their required platform. In case of new versions also the consumers have to take the responsibility to update the system in accordance with the advancement of technology.