**2. Types of service models**

Cloud service providers harness the benefit of huge computing resources span over large geographical area to provide seamless, efficient and reliable services to customers at marginal price. The computing resource deployed over the Internet comprises hardware and application software and OS used in virtualization, storage

**Figure 1.** *Cloud service model.*

and compute purposes. There are basically three different service models (**Figure 1**) of offering high-volume low-cost services to the end user:

